Main Functions : Rated Impedance: 4ohm+0.5ohm Output Power : 2.2W*2,(1KHZ, THD10%) Supply Voltage: 5V (4.5-9V, 4*AAA and PC USB) Circuit Current: ??00mA Frequency Response:(150HZ-20KHZ), Degree of Dissociation: ??2dB Supply Voltage Rejection: ??8dB