Compact Class D amplifier for factory and aftermarket receivers * Universal plug lets you send signal from RCA outputs or speaker-level wiring * Runs off same power circuit as receiver. Includes pair of ground loop isolators ( small silver boxes pictured) * 45 watts RMS x 4 at 4 ohms (CEA-2006 compliant) * Dimensions: 7-7/8"W x 1-1/2"H x 2-9/16"D