-Bluetooth 2.1 wireless transmission protocol
-No wire, no transmitter, no software, easy and fast.
-Hidden microphone Bluetooth headphones, Bluetooth headset with microphones Light and comfortable Super bass With vol control... -Fashion headphone Static Current: Under 10UA -Working Current:Under 30mA -Working Voltage:4.2V -Charge Current:30mA---150mA(Red LED light up) -output power:L-20mw R-20mw(32Ω) -Battery Capacity: 330mAH 3.7v -Charge Time: 3 hours -Working Time:Above 8 hours Battery Life -Charge and discharge≥300 times -Available Distance: ≥10M (Open and no block) -Input Voltage: DC 5V/200mA -Standby Time: Above 30 hours Support V2.1+EDR Bluetooth version Class 2.