M600/1 - JL Audio Monoblock M Series 600 Watt Marine Class D Amplifier M Series Monoblock Class D Car Amplifier Unregulated MOSFET switching type power supply NexD Ultra-High Speed Class D topology LED power (green) and protect (red/yellow) indicators Dimensions: 8-1/2"L x 7-1/16"W x 2-1/16"H