Designed to support multi-zone technology to fill your entire boat with sound. The Zone Amplifier is small enough to allow discrete installation, but powerful enough to provide a platform for a true multi-zone audio system. Water resistant design. Audio detect selectable function: amp turns on when audio is detected and goes to sleep/low power mode when audio is not present. Selectable high pass/full range setting and variable high pass filter. Max power rating: 70 watts. Rated power 10-16V: 20 watts RMS @ 4 ohms per channel; 33 watts RMS @ 2 ohms per channel. 5"L x 3.1"W x 2"H.