*Audio stereo earphone with built-in Mic for hands-free calling 
*Speaker: 10mm 
*Bluetooth version: V4.1+EDR,  Chipset: CSR8635                  
*Support Bluetooth HSP, HFP, A2DP and AVRCP                   
*RF frequency range: 2.402-2.480GHZ, 2.4G ISM band              *Operating range: 10M                
*Talking time: about 8Hours                                                   
*Music playing time: 6 Hours                                                
*Standby time: 180Hours  
*Battery: 50mA                                                  
Features:                                                                           
* Magnetic necklace style  for sports
* High definition sound
*Volume control switch in-line
* Light weight for sports
* UV oil coating or rubber oil coating
* Powerful 50mA battery for long working time