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健康，美容及婴儿护理供应商和制造商

Health, Beauty and Baby Care

广州市普格斯日用制品有限公司

The highlighted anti-tipping furniture strap can stop furniture from falling when children reach for cupboards and cabinets. It can be mounted on walls and can securely keep furniture in place. This furniture strap is easy to install and is suitable for flat TVs, cabinets, dresser, bookcases, wardrobes and other tall thin furniture. 	 Material: nylon + iron + screw. 	 Stop furniture from falling when children reach for cupboards and cabinets. 	 Avoid furniture tipping over by mounting the furniture strap on walls. 	 Securely keep furniture in place. 	 Unique design, safe and secure to use. 	 Detachable end for cleaning the furniture for floor. 	 Smart and basic baby safety product for furniture and TV use. 	 Installation: all mountings are made of heavy duty metal, will not break easily like plastic ones. 	 Straps are made of Japan Standard nylon, which has maximal bearing of 177 lb. 	 Multi way using - not only for flat TV. 	 You can screw mount it to cabinets, dresser, bookcases, wardrobes and other tall thin furniture. 	 Easy to install - only take few minutes to finish installation. 	 Need 2 straps attach to one TV or large pieces of furniture. 	 All hardware included-package content 2 straps, 18 screws, 2 washers, 4 capsules. 	 Straps length 30&quot; at longest, please note the biggest screws are 6mm. 	 If your TV need a bigger screw on the VESA holes for a wall mount, our straps may not be suitable for you. 	 100% money back guarantee. 	 We always provide the highest quality made products. 	 Be confident to order from Round square. 	 If for any reason they fail you in any way, we will refund you no questions asked. 	 Size: dia20mmx65cm, 2 pieces. 	 Certification: REACH, PAHS, EN71, AZO, etc. 	 Package: blister card. 	 Card size: 19x11x1.7cm. 	 Out carton size: 48.5x39.5x25.5cm. 	 Delivery time: 30 days after confirm your PI. 	 Payment terms: TT, 30% deposit and the balance against copy of B/L. 	 Sample time: within 7 days baby product companies.  

Anti-Tip Safety Furniture Strap

Jinghao International (HK) Ltd.

●The first batch of smart hearing aids to obtain FDA OTC 510K certification in China ●Thoughtful design, Comfortable to wear ●Through the APP, wireless hearing test can be performed, and personalized according to individual needs with one click ●You can connect your cell phone, tablet, or TV via Bluetooth, and quietly enjoy your world alone. ●Charge for 15 minutes, hearing aid for 8 hours. ●IP65 dustproof and waterproof. ●SIP waterproofing process for long-lasting equipment  

JINGHAO DW3F Self Fitting OTC Smart Hearing Aid

Sunstar Digi (H.K.) Co., Ltd.

Type: Digital hearing aids behind the ear (BTE) style ● Hear what matters, forget the rest. ● Advanced background noise cancellation:say goodbye to distracting background noise,hear every word with crystal clarity and join any conversation with newfound confidence. ● Easily switch hearing modes,hearing your loved ones more clearly. Enjoy both the TV and conversations. ● Even smaller, even more invisible:smallest hearing aid, making it so comfortable you'll forget you're even wearing it, and so invisible others will too. ● Digital channels so higher magnification and louder clearer sound. ● Long comfortable wear no pain. ● Rechargeable long standby time. ● Intelligent digital howling suppression. ● Email: jessica@sunstardigi.com  

Digital FDA OTC Hearing Aids

港芝国际有限公司

Used to improve hearing ability for the hearing impaired, this assistive listening device delivers crystal clear stereo amplification. Soft earbuds are made to ensure users can wear it comfortably all day long. With just one AAA alkaline battery, this gadget is capable of running up to as long as 30 hours. 	 Material: ABS plastic. 	 Uses a swivel microphone. 	 Constructed with stereo headphones. 	 Includes comfortable earbuds. 	 Delivers crystal clear stereo amplification. 	 Constructed with on/off/volume control wheel. 	 Provides up to 50+ dB sound gain. 	 Runs up to 30 hours with one AAA alkaline battery. 	 Durable and simple to use. 	 Features the latest, state-of-the-art SMT microelectronics. 	 Complies with ADA, MDS and CMS.  

Assistive Hearing Device

 	 Features the latest state-of-the-art clear stereo sound amplification 	 Provides up to 50+db ambient sound gain 	 Volume control wheels permits easy volume adjustment 	 3 position frequency switch allows user to enhanced desired frequency range 	 Unobtrusive stereo type earphones feature matched output drives to deliver clear, crisp sound 	 Convenient belt clip 	 Lighted &quot;on/off&quot; switch 	 Applications: Ideal for watching TV, improved hearings at worship, lecture or meeting, or simply get more enjoyment during day-to-day conversation 	 2 x &quot;AA&quot; alkaline batteries included  

 	 Amplify sound to assist hearing. Pick up sounds upto 100 yards away. Volume control wheels permits easy volume control. Handy size for each carrying. 30-minutes auto-off to conserve battery life.  

Personal Hearing Device

 	 Personal sound amplifier with 3-position frequency selector 	 Volume control wheels permits easy volume adjustment 	 3-position frequency switch allows users to enhance desired frequency range 	 Increase up to 50+db of ambient sound gain 	 Convenient belt clip 	 Lighted on / off button 	 Power: 2 x AA alkaline battery, included  

Personal Sound Amplifier

&nbsp;Shown here is the lab-tested hearing aid set, featuring a handy volume control wheel on the head-phone lead wire, allowing an easier volume adjustment. Operated with simply two AAA batteries, this device would automatically turn-off to save energy. With sound isolation circuit to minimize feedback, this set comes with lightweight earphone, allowing a more comfortable wear. 	 Hearing aid 	 Laboratory tested. 	 Up hearing aid standard. 	 Volume control wheel on the head-phone lead wires. 	 Swivel microphone 90 degree to increase directionality. 	 30 minutes auto shut-off to conserve battery. 	 Use 2 AAA alkaline batteries. 	 Lightweight and unobtrusive stereo earphone for comfortable wear. 	 Sound isolation circuit to help minimize feedback from personal handling.  

Hearing Aid 

Engineered with state-of-the-art SMT microelectronics, this assistive hearing device gives crystal clear stereo amplification. With a belt clip, this light toned and compact gadget is perfect to be brought here and there. It comes with 3-position frequency switch that allows users to adjust the frequency range freely. 	 Compact and light-tone assistive listening device. 	 &ldquo;On/Off&rdquo; light button. 	 Volume control wheel for ease of adjustment. 	 3-position frequency switch offered. 	 Provides up to 50+ dB sound gain. 	 Rechargeable Ni-MH AA batteries (included). 	 Operates up to 40 hours per charge. 	 110/240VAC-capable charging cube included. 	 Offers USB cable for charging. 	 Convenient belt clip. 	 Unobtrusive stereo over-the-ear earbud-type earphones. 	 Features matched output drivers to deliver clear, crisp sound. 	 Complies with ADA, MDS and CMS.  

Assistive Listening Device

港芝制造有限公司

 	 Features the latest state-of-the-art SMT microelectronics for crystal clear stereo amplification. &nbsp;Comply with the American with Disabilities Act (ADA), MDS and CMS. 	 Volume control wheel permits easy volume adjustment. 	 3-Position frequency switch allows user to enhance desired frequency range. 	 Provides up to 50+ dB of ambient sound gain. 	 Rechargeable Ni-MH AA batteries (included), provide up to 40 hours of operation per charge. 	 110/240VAC-capable Charging Cube and USB cable are also included. 	 Unobtrusive stereo over-the-ear &ldquo;earbud&rdquo; type earphones feature matched output drivers to deliver clear, crisp sound. 	 Convenient Belt Clip. 	 Lighted &ldquo;On/Off&rdquo; button. 	 Application: Ideal for Watching TV, Improved hearings at worship service, lecture or meeting, or simply for gaining more enjoyment from simple conversation.  

- Volume control wheel permits easy volume adjustment.
- 3-Position frequency switch allows user to enhance desired frequency range.
- Provides up to 50+ dB of ambient sound gain.
- Rechargeable Ni-MH AA batteries (included), provide up to 40 hours of operation per charge.
- 110/240VAC-capable Charging Cube and USB cable are also included.
- Unobtrusive stereo over-the-ear &ldquo;earbud&rdquo; type earphones feature matched output drivers to deliver clear, crisp sound.
- Convenient Belt Clip.
- Lighted &ldquo;On/Off&rdquo; button.
- Application: Ideal for Watching TV, Improved hearings at worship service, lecture or meeting, or simply for gaining more enjoyment from simple conversation.
&nbsp;

聪言听健服务有限公司

 	 Fully digital air-conduction hearing aid suitable for clients with mild to profound hearing loss.&nbsp; 	 For further details, please contact us&nbsp;  

Hearing Aid

元勋国际股份有限公司

This hearing aid is designed to be worn behind the ear. It comes in a skin toned color and is different to notice. It can amplify sound and offers good sound quality.

Specifications: 	 Digitally + programmable hearing aid. 	 Type: behind the ear (BTE). 	 Standard frequency: 2500 Hz. 	 Max gain: 40+/-5dB. 	 HSP level input SSPL 90dB: 125 +/-5dB. 	 Equivalent input noise level: 25dB +/-5dB. 	 Total harmonic distortion value (HDV) of reality: 	 1600Hz: below 3%. 	 800Hz: below 4%. 	 500Hz: below 4%. 	 500Hz: below 4%. 	 Operating temp / humidity: +10&deg;C ~ +40&deg;C，30~85% RH. 	 Storage temp / humidity: -10&deg;C ~ +60&deg;C，30~85% RH. 	 Battery type: p13 button size battery. 	 Power consumption: 1 mA. 	 Skin colored exterior. 	 Easy to use. 	 Comfortable to wear.&nbsp; 	 Good sound quality. 	 Weight: 4.6g.  
Product includes: 	 1 x hearing aid. 	 1 x ear cap: 1 for each size (L, M, S). 	 1 x cleaning brush. 	 1 x storage cases. 	 1 x instruction manual.  

BTE Hearing Aid

Featured here is a hearing aid in a behind the ear style. It offers an adjustable volume and simple buttoned controls. This hearing aid is comfortable to wear and allows the hearing impaired to hear clearly.
&nbsp;
Specifications: 	 Type: behind the ear (BTE). 	 Standard frequency: 2500 Hz. 	 Max. output sound level gain: 50 &plusmn; 5 dB. 	 Max. SPL* for input 90dB: 125 &plusmn; 10dB. 	 Equivalent input noise level: below 29dB. 	 Battery type: V40H rechargeable battery. 	 Continuous use: 12-16 hours per charge / 300+ recharges 	 Total HDV* of reality: 1600Hz: below 4%, 800Hz: below 5%, 500Hz: below 5%. 	 Operating temp / humidity: +10&deg;C ~ +40&deg;C, 30~85% RH. 	 Storage temp / humidity: -10&deg;C ~ +60&deg;C, 30~85% RH. 	 In-ear earpiece. 	 On/off button at the back. 	 Rotary switch for volume control. 	 Comfortable to wear. 	 Amplify sounds for the hearing impaired. 	 Dimension: carry case (96 x 66 x 22 mm). 	 Weight: hearing aid (6.0g), carry case (62.5g).  &nbsp;
Product includes: 	 2 x hearing aid (rechargeable battery built-in). 	 1 x AA battery. 	 1 x AC adapter. 	 4 x ear cap pair (T, S, M, L). 	 1 x cleaning brush. 	 1 x charging carry case.  &nbsp;
*SPL = sound pressure level.
*HDV = harmonic distortion value.

This behind the ear hearing aid is designed to offer clear hearing to those with hearing impairments. It comes in a skin tone and is comfortable and unnoticeable to wear. The hearing aid has buttons at the back for controlling volume and on/off.

Specifications: 	 Type: behind the ear (BTE). 	 Standard frequency: 2500 Hz. 	 Max. output sound level gain: 60 &plusmn; 5 dB. 	 Max. SPL* for input 90dB: 125 &plusmn; 10dB. 	 Equivalent input noise level: below 20dB. 	 Compression channels: 8. 	 Battery type: Ni-MH P13 rechargeable battery. 	 Continuous use: 12-16 hours per charge / 300+ recharges. 	 Total HDV* of reality: 1600Hz: below 3%, 800Hz: below 4%, 500Hz: below 4%. 	 Operating temp / humidity: +10&deg;C ~ +40&deg;C, 30~85% RH. 	 Storage temp / humidity: -10&deg;C ~ +60&deg;C, 30~85% RH. 	 In-ear earpiece. 	 On/off and volume button at the back. 	 Comfortable and unnoticeable to wear. 	 Designed for offer clear hearing. 	 Dimension: carry case (82 x 42 x 60 mm). 	 Weight: hearing aid (3.4g), carry case (57g).  
Product includes: 	 1 x hearing aid. 	 2 x P13 rechargeable battery. 	 2 x AAA battery. 	 1 x AC adapter. 	 3 x ear cap pair (S, M, L). 	 1 x cleaning brush. 	 1 x storage box. 	 1 x charging carry case.  
*SPL = sound pressure level.
*HDV = harmonic distortion value.


Xiamen Retone Hearing Technology Co.,Ltd.

 	 Digital Processing 	 4 channels WDRC amplifier 	 12 bands frequency shaping 	 Wideband MPO 	 10 bands LNR Layered Noise Reduction 	 Directional mic 	 AFC Adaptive Feedback Cancellation 	 4 memories provide: Quite/noise/music/phone 	 Low battery warning 	 Low power consumption 	 Programmable 	 APP provide: Volume, treble and bass adjust Programs switch Pure tone audiometry auto fitting pure audio streaming 	 E-charger &amp; rechargeable battery 1 hrs quick charging 14 hrs hearing aid mode or, 2 hrs music/phone mode  

Rechargeable with Wirelss Digital Hearing Aid

 	 Digital processing 	 4 channels WDRC amplifier 	 12 bands frequency shaping 	 Wide band MPO 	 10 bands LNR layered noise reduction 	 Directional mic 	 AFC adaptive feedback cancellation 	 4 Memories Provide: Quite / noise / music / phone 	 Low battery warning 	 Low power consumption 	 Programmable 	 App Provide: Volume, treble and bass adjust programs switch pure tone audiometry auto fitting pure audio streaming  

Wireless App Control Digital Hearing Aid

中山市大耳朵电子科技有限公司

 	 Peak OSPL 90 ( dB SPL): 129dB 	 HAF &nbsp;OSPL 90 ( dB SPL): 120dB 	 Peak &nbsp;Gain(dB): 50dB 	 HAF / FOG Gain (dB): 38dB 	 Frequency range(Hz): 500-4500Hz 	 Distortion:	 		 500Hz: 5% 		 800Hz: 3% 		 1600Hz: 3% 	 	 	 Equivalent Input Noise (dB): 28dB 	 Voltage: D.C.3.7V 	 Current: &le;2mA 	 Charging Time(H): 4~6 	 Working Time(H): 100h  

Rechargeable Digital Hearing Aid

 	 BHM contact Mini device is suitable for adult and children with conductive or mixed hearing loss, available wearing style includes: 	 Soft band 	 Hard hand  

BHM Contact Mini Bone Conduction Hearing Aid 

Microtech System

 	 20 channels 	 Digital Hearing Aid Amplification Algorithm . 	 Non-linear sound compression amplification algorithm . 	 Strengthened noise removal technology . 	 Automatic sound output control . 	 Bluetooth Function . 	 Self Hearing Test and Automatic Fitting . 	 Selection of environment mode . 	 Power Management 	 FDA / CE Medical / FCC  

深圳市贝斯曼精密仪器有限公司

   Detect the blood stream status of arterial/venous by 8.0MHz; detect the blood flow average velocity, detect the result of finger/toes and part of body's vein anatomies operation. Bar LED can detect the blood stream status. Ultrasonic probe:8.0MHz&plusmn;10%   It can be used to listen the temporo-mandibular joints (They become noisy when they start to brake because of the bite problems), assist doctor to check the conditions of the joints and predict the result of treatment.   Battery: 7.4V/900mAh rechargeable Lithium   Detect peak and average blood speed   Detect blood flow of peripheral vessel   Detect subsection systolic pressure   Detect phlebostenosis, vein occlusions   Detect Systolic pressure of toes and fingers   Detect blood speed during recovery   Detect the pulse rate and show PR simultaneously  

Vascular Doppler  Connect Computer

惠州市锦好电子有限公司

Specification 	 Sound Output(SSPL): 128+-3dB 	 Sound Gain(SSPL): 50dB: 95+-3dB 	 Noise: EIN: &lt;26dB 	 Frequency Range: 400Hz-4200Hz 	 Working Current: 3.5mA 	 Harmonic Wave Distortion(THD): Volume reference &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 	 500Hz: &lt;=3% &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 	 &nbsp;800Hz: &lt;=5% &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 	 1600Hz: &lt;=1% 	 Rechargeable Battery: NI-MH 	 Recharge Time: 7 hours 	 Working Time: 16 hours  Features: 	 Pair of revolutionary BTE amplifier: hearing amplifier with specialized noise reduction facility is an ultimate solution for those who require optimal sound amplification 	 Innovative construction: this personal sound amplifier designed by an audiologist 	 Has some unique features like noise reduction and feedback cancellation that will eliminate unwanted sound and let you hear only what is necessary 	 Ultra light and virtually invisible: for convenience the BTE hearing amplifier is constructed extremely small and light 	 Body is half transparent and won&#39;t be noticed by others easily 	 Highly comfortable: made of high quality materials, the device is safe and pretty much comfortable to wear 	 Fits perfectly on individuals of all ages 	 Rechargeable: with rechargeable feature, you won&#39;t have to purchase replacement batteries 	 You can simply charge it via USB or AC power outlet 	 Also, our device is designed to consume minimal power&nbsp;  Packing and accessories: 	 2&nbsp;Charger hearing aid aids ear audiphone 	 4 Ear&nbsp;tips 	 1 USB charging 	 2 Cleaning tools 	 1 Manual&nbsp;book 	 1 Strong gift box  

Double Charger Hearing Aids

 Specification  	 Item No.,: &nbsp;JH906 	 Color: Beige/optional colors 	 Frequency range: 200Hz-5000Hz 	 Total&nbsp;harmonic wave distortion: 	 500Hz&le;6.1%, 70dB&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 	 800Hz&le;0.9%,70dB&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 	 1600Hz&le;1.5%, 65dB 	 OSPL90 &nbsp;Max @ 700Hz, 126.4dB &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 	 HFA AVG 100.5dB 	 FOG50 &nbsp;Max @ 700Hz 38.0dB &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 	 HFA AVG 11.6dB 	 Reference test gain Target: 11.7dB &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 	 Measured: 11.7dB 	 EQ input noise: &nbsp;57.2dB 	 Response limit: &nbsp;51.7dB &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 	 F1&lt;200 &nbsp; &nbsp;F2=4380Hz 	 Battery type: &nbsp;A312 	 Working time: &nbsp;20 hours 	 Battery capacity: &nbsp;160mAh 	 Working time: &nbsp;100 hours   Features:  	 Brand new and high quality hearing aid sound amplifier 	 Super mini size and light weight, not easily to be seen 	 Adjust volume to the minimum before wearing 	 Increase volume gradually to avoid sudden increase in sound 	 Convenient for watching movie, enjoying the drama, attending meeting, or having class, it could help you hear the sound clearly and loudly   Packing and accessories:  	 1 Hearing amplifier 	 3 Ear&nbsp;tips 	 1 Velvet&nbsp;box 	 1 Manual&nbsp;book 	 3 A312 battery  

Mini ITE Hearing Amplifier

 Specification  	 Max Sound Output: 125 &plusmn; 5dB 	 Sound Gain: &ge;45dB 	 Total Harmonic Wave Distortion: &le;5% 	 Operation Current: &le;4mA 	 Frequency Range: 200-6000Hz 	 Input Noise: &le;30dB 	 Voltage: 1.5V 	 Battery size: LR754 	 Battery capacity: 68Mah 	 Working time: 25H   Features  	 1.Exquisite design,obvious button, easy operation 	 2.Corresponding uncomfortable threshold properly adjust the maximum output, protect ear 	 3.3 Different shape earplugs are provided, which can fit different people&#39;s ear; 	 4.Open fit type hearing aid, the tube can be adjustable to different sizes ears with comfortable wear; 	 5.Clear sound quality with low noise microphone, balanced armature loudspeaker and high gain integrated amplifier; 	 6.Low frequency and high frequency are changed by one switch to adjust different environment.  

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