Output :  Rms 6w (3w+3w) thd = 10%

Frequency responese 150-18000Hz

Signal and noise ratio of power amplifier : >= 80dB

Loud speaker : 1.5inch (external diameter 40mm) magn etic resistant 4 hms 

Input: 5.0V

Output : 3.7V * 1000MA

Built-in rechargeable 

Li-ion Batt