100 Watts Class T Hi-Fi Audio Amplifier W/USB SD Reader and AC ADAPTER Included "Audio Output Power 100wClass T Circuit Design 12v, 2A Ac Dc Adapter Can Use For Home or Car 3.5mm IpodMp3 Input Jack MIC Input Jack Short Cut, Overload, Overheat Protection USBSD Card Reader Function with Display Screen Dimensions: 6.97'' x 4.84'' x 1.69''