Specification 
Bluetooth Version : v 5.0 + EDR 
bluetooth Profiles : HFP , HSP , A2DP , AVRCP
CHIP: CSR 
BATTERY : 100 mAH 
Working Time : 7 hours
Charging time :  1-2 hours
Standby Time : above 200 hours 
Operation Range : 10 meters 
Features:
Stereo Sound Music 
CVC noise reduction technology 

Clip-on  style and retractable type 

Vibration prompt 

IOS Battery capacity display 

Call recive function 

Stereo high definition music 

Last number reial 

can connect 2 mobile phones at the same time