KOGI-I7

Bluetooth Version: V4.2
Frequency Range:20Hz-20kHz
Sound Output:2.5mW
Sensitivity:99db+3db
DC Resistance:32Ω
Receiver Distance:Up to 10 meters
Battery Voltage: Inbuilt Rechargeble battery 600mAh 
Charging Voltage:DC 5V
Charging Time:20-40 minutes
Music/Talk Time:3.5  hours
Features:Automatically Matching,Sensitivity Microphone,Easily Charge via USB Port,Volume Control  etc.

Color: Yellow, Blue