CPU: Han Tianxia 6621DQ

APP：LEFUN

NFC function: Supports NFC without access(NFC chipset:FUDAN MICRO M1)

Charging chip: SiGma Micro SGD31

Acceleration sensor: MSA310

Battery: 12mAh for small size, 20mAh for big size, 3.7/4.2V lithium battery

APP system requirements: "Android: 8.0 or above/iOS: 13.0 or above"

Bluetooth version: 4.0 Bluetooth version depends on the chip and protocol stack used

Charging voltage: 4.6~5.2V, supports high voltage chargers

Display screen, touch panel, physical buttons, encoder support: not supported

Optoelectronic PPG Analog Front End (PPG AFE): Tianyi Hexin HX3918

Step counting accuracy: ≥ 95% under normal walking conditions

Sleep detection error: ≤ 1 hour

Resting heart rate accuracy: ± 3bpm including manual measurement and automatic monitoring

Dynamic heart rate accuracy: ± 10bpm under regular exercise conditions such as running

Blood oxygen accuracy: ± 3%

Working endurance time: 3-4 days

Standby battery life: 6 days

Power off battery life: 30 days

Power consumption requirement: 150uA

Electricity display error: ≤ 3%

Charging duration (hours): 1H

Bluetooth emission intensity: 0dB chip emission power (chip output end)

Bluetooth center frequency offset: ± 24KHz

Bluetooth received signal strength: ≥ -50dB, straight distance of 20cm (360 degree test)

Bluetooth wireless sensitivity: ≥ -90dB

Function:

Motion measurement: N/A

Sleep monitoring: 22:00~8:00 (automatically extended to 12:00)

Multi sport mode: N/A

Heart rate measurement: supports automatic measurement with an interval of 1 hour

Blood pressure measurement: supports photoelectric automatic measurement with an interval of 1 hour for measurement

Blood oxygen measurement: supports precise automatic measurement after 1 hour of interval measurement

Automatic health monitoring: supports default monitoring, with an interval of 1 hour, and comes standard with saving heart rate, blood oxygen, and body temperature data

Activity information data storage: supports real-time storage

Manual measurement of heart rate/blood oxygen: The APP supports manual measurement

Historical data storage duration: 7 days. Rolling storage includes automatic health monitoring data and activity information data

Touch control: N/A

Low battery shutdown: supports shutting down when the battery level is below 5%

OTA upgrade: Support APP cooperation requirements to automatically re upgrade if the upgrade fails; Indicator light indication

Automatic recovery function: supports automatic saving of time, steps, calories, and mileage every 30 seconds to prevent reset loss

Self check function: Supports automatic inspection of all sensors and hardware components when powered on, displaying fault information pages without setting or automatic synchronization time, for easy testing and

Troubleshooting during the production process“

Zero crossing data clearing: supports clearing daily activities (steps, calories, mileage) at 00:00:00