HARLEY MOTORCYCLE STEREO POWER AMPLIFIER 4CH &gt;&gt; 400 &lt;&lt; WATTS KIT BIKE ELETRONICS Compact 4-channel amplifier for car, motorcycle, and boat 45 watts RMS (100 watts peak) x 4 at 4 ohms non-bridgeable, 4-ohm stable per channel MOSFET power supply and Class D amp Dimensions: 5-1/2"W x 1-5/16"H x 3-9/16"D