Watch phone style Speaker B20,support Bluetooth/TF/FM/Handsfree/Autodyne

Specification:
Output power: 3W
Sensitivity: 360mV
SNR ( Signal to Noise Ratio ): 80dB
Input power supply:DC5V/500mA
Charging Voltage: DC-5V 500mA
Frequency Response: 120Hz-20KHz
Charging Time:
Using Time:6 hours
Bluetooth version:Bluetooth V2.1+EDR

Features:
1.This speaker owns excellent sound quality,with perfect audio design.
2.Bluetooth audio transmission and handsfree call.
3.Bluetooth selfie while listening to music.
4.FM radio
5.Prompt tone for any work status.
6.TF card playing mp3/wav format music.
7.Inbuilt high-capacity li-ion battery for power supply,long standy time.