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). DETAILSBridgeable Audio Amplifier 2-Channel System Dual MOSFET Power Supply Marine Grade Construction Waterproof Marine Rating IP-01 Stereo / Bridge Mode Selection Switch Adjustable Input GAIN Level Control RCA (L/R) Input Connector Jacks High Level Speaker Input Connector Power & Protection LED Indicator Lights Gold-Plated Speaker Output Terminal Connectors Crossover Frequency Control Anti-Thump Delay Circuitry Built-in Thermal, Overload & Speaker Short Protection Heavy Duty Aluminum Alloy Heatsink Remote Turn ON/OFF Technical Specs: MAX Power: 400 Watt RMS Power: 200 Watt Amplifier Class: AB Fuse Type: 15A Crossover Frequency Adjustable: 40 - 450Hz Frequency Response: 10 - 30kHz +/-3dB Input Impedance: 10k Ohms Input Sensitivity: 250mV-1V Matching Speaker Impedance: 4-8 Ohms T.H.D.: