Operation Voltage DC 11.5v to < 15v * 3.5mm Input Compatible with Audio Output of iPod and Other MP3 Players * Rotary Volume Control * Marine Grade Speakers * Mounts to Bars 0.9" to 1.25" * DIGITAL Mini AMPLIFIERMax Music Power 100w/2 way The operation voltage DC 11.5v to less than 15vAux input compatible with audio output of iPod and other MP3 playersA Volume Controller with Sound CutA Fuse stick to plus wiring * SPEAKERS Two 2" Waterproof marine grade Speakers Music Power 100wImpedance 6 Ohm Frequency Response 35 to 15,000 Hz * Fits bars 0.9" to 1.25"