The Pyle Elite Series Amps provide waterproof power for all of your speaker needs. The marine grade waterproof construction and high-power efficiency ratings provide performance and reliability -- rain or shine! These multi-channel amplifiers are perfect for the back yard boat or even by the pool! Additional features include MOSFET power supplies built-in electronic circuitry protection heavy-duty aluminum heat sinks and more. Enjoy versatile waterproof performance and next level sound amplification with the Pyle Elite Series Amps. (Models: PLMRA200 PLMRA400 PLMRA420 PLMRA620 PLMRA820).