... ,MP5,PC,Laptop/Notebook,Mobile phone,etc...all kinds of digital player devices. Features: 1) 2.0 speaker for laptop, computer, ... phone. 2) Carry-home, plug and play 3) High-efficience Class-D professional digital vedio amplifier.3D sound effect 4) USB provides ... Output Power: 3W*2(1KHZ,THD10%)2) Rated Impedance:4Ω3) Circuit Current:≤800mA4) Frequency Response: 2000HZ——12KHZ5) Supply Voltage Rejection ...