KOGI-K31

Bluetooth Version: V4.2+EDR
Receiver Distance: Up to 10 meters 
Working Time: Up to 6 hours
Support: TF/Micro-SD card
Impedance:32ohm+/-10%
Battery:Rechargeble Lithium-battery(250mAh)
Functions:Bluetooth, Calling, Volume control, Switch songs, Answer/Reject a call, Hung up  phone, Redial, Voice prompt, Battery status, FM, MP3

Colour:Red,Green, Black, Purple, Blue, Gray,