Speaker Impedance: 4 ohm.
Power Output: 3W.
Freq: 60Hz~20KHz
S/N: 95dB.
Power Source: USB
Charging Voltage: 5V
Charging time: 2.5 hours 
Lasting time: 2 hour
FM Radio Frequency: 87.5~107MHz.
Battery: 300mAh/ Lithium-ion battery/ 3.7V