Stereo pc speaker 20 pc speaker system series hercules xps colour black transmission mode cable power rating 30 watt effective output 60 watt speaker system 20 system system active power supply mains connection suitable for desktop pc notebook cdmp3 player speaker controls controls on speaker satellite features magnetically shielded wooden housing dimensions w x h x d 22 x 13 x 10 5 cm rated power subwoofer 30 w