Recom Mambobass wireless mini speaker
Speaker Device : 40mm
Speaker power : RMS 3W
Frequency Response :60 ~ 20,000 Hz
Battery Specification :400MA li-battery
Working voltage and current : V 3.7V 40mA
Charger adapter output : DC 5V 200mA
Nominal charging time : Max 2 hours
Signal/Noise Ratio : >95 dB
USB power : DC 5V +_5%