Pc with or without audio card, with usb port It can work with mp3, mp4, and so on.. It also can connect other audio devices through usb, eg: multi-audio devices, and etc. 1) frequency response: 20hz-20 khz 2) speaker impedance: 32+ 3) driver unit: 40mm 4) rated power: 20mw 5) power handling capability: 100 mw 6) cable length: 2.50 m 7) sensitivity: 117db 8) microphone: 6ß5mm-58db+/-3db 9) plug: usb port 3.5mm stereo, microphone in pink, Earphone in reseda. According to your demand
