Wireless Stereo Bluetooth Earphone
> Bluetooth vertion:V4.1
> Battery:50mA Li-polymer>2hrs
> Frequency range: 20-20,000Hz
> Driver unit diameter: 40mm
> Talk time: 2-2.5hours
> Built-in microphone
> Sound pressure level: 80±3dB
> Standby time: over 100hours
> Charging time:About 1 hours