Main Features:
1.Rechargeable Bt speaker for mobile phone/tablet pc
2.Built-in rechargeable battery
3.Built-in microphone for phone calling 
4.High-fidelity sound, stereo speakers
5.Support TF/FM/USB/line in function

Specifications:
1.Transmission distance: 10m
2.FM |Frequency Range: 100Hz-16KHz
3.Rated power: 3W+3W, Battery Capacity:3.7V 1800mAh
4.Play time:up to 6 Hours, Charging Hour:2.5-3.5hours
5.Input voltage: DC5V-500mAh