A three-piece PC audio system co-developed by Microsoft and Philips. On top of the Right speaker are the manual controls of the DSS80. There are five pushbutton controls: Mute on/off Bass - Bass + Volume - Volume + There is also one indicator on the Right speaker. It shows Green when the unit is operational, Amber on stand-by and flashing Green/Amber when muted. For desktop or laptop computers or for a standalone mp3 audio system. Technical specifications System type: Biamplified, stereophonic speakers and monaural subwoofer Amplification: High efficiency, class-D switch-mode power amplifier Rated power output (per IEC 268.3): Subwoofer: 44 W Left/Right Speakers: 32 W, 16 W per speaker Frequency response: 40 Hz to 20,000 Hz Transducers: Subwoofer: 5.25" Dual voice coil active woofer, 6" wOOx passive radiator Left/Right Speakers: 3" full range, magnetically shielded Power supply (subwoofer only): AC 110-220 V, 50–60 Hz, 310 mA @ 220 V Electronic crossover frequency (subwoofer to a speaker): 160 Hz Electronic crossover filter slopes: Subwoofer: -18 dB/octave at 160 Hz Left/Right Speakers: +12 dB/octave at 160 Hz Digital input sensitivity: Full Scale minus 12 dB Analog input sensitivity: 0.180 V rms for rated output power Analog input impedance: > 10 kΩ Complete - Comes with all cords and everything needed