Pyle 4-Channel Marine Amplifier Receiver - Waterproof and Weatherproof Audio Subwoofer for Boat Stereo Speaker & Other Watercraft - 1200 Watt Power, Wired RCA, AUX and MP3 Audio Input Cable - PLMRMP4A WATERPROOF & WEATHERPROOF: The audio amplifier is waterproof with its marine grade rating of IP-65. It has a rugged construction and integrated power wiring harness to combat weather conditions POWERFUL 1200 WATT: This amplifier receiver is powerful with its 1200 watt max. It has an anti-thump turn on and soft turn on or off to save energy. Comes with 2 to 4 Ohm speaker impedance and adjustable volume control 4 CHANNEL AMPLIFIER: Pyles PLMRMP4A is engineered as a 4-channel marine amplifier that powers up any boat stereo speaker and is universally compatible too. It has wired RCA, AUX and MP3 audio input SHORT PROTECTION: Built with a heavy duty heatsink, thermal overload speaker short protection to protect the amp and your vehicle's electrical system from short circuit conditions. It has 12V DC and 10A fuse COMPACT AND LIGHTWEIGHT: The amp is compact with an exact dimension of 5.3 x 3.5 x 2.1 and lightweight with only 1.94 lbs. The T.H.D is 0.1%, S/N Ratio is &gt; 95 dB, channel separation is &gt; 65 dB and the frequency response is 10 - 40kHz