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4-Channel Marine Amplifier: Built-in Bluetooth for Wireless Music Streaming Dual MOSFET Power Supply Marine Grade Construction Waterproof Marine Rating IP-01 Silver-Plated Speaker Output Terminal Connectors Adjustable Input GAIN Level Control Anti-Thump Delay Circuitry Built-in Thermal, Overload & Speaker Short Protection Heavy Duty Aluminum Alloy Heatsink Output Power: 100 Watt x 4 MAX Amplifier Class: AB Bluetooth Wireless Range: 25' Feet Fuse Type: 20A Input Gain Impedance Adjustment: 1 - 300mV Frequency Response: 15Hz - 30kHz +/-3dB Input Impedance: 10k Ohms (Low), 100 Ohm (High) Input Sensitivity: 250mV (Low), 2.5V (High) T.H.D.: