Macally TUNEFAN Stereo speakers with built-in subwoofer and cooling fan is made to provide great audio from your laptop (Mac or PC) while keeping it cool with the USB powered fan. It fits laptops 17inch and under. High quality speaker drive: Right/Left 2" 2Watts x 2, Subwoofer 2 1/4inch 10 Watts. Supports both USB 2.0 and 1.1.