1, 2.1 active speaker system 2, Built-in 2.1CH amplifer system 3, Usage: Computer,MP3,MP4... 4, RMS;40W Features:1, Power Supply;universal power supply2, With remote control3, Output power;45W4, S/N;≥75db5, Frequency; Subwoofer 28-220Hz; Speaker 150-20KHz The best 2.1 computer speaker