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Marine Bluetooth Amplifier with a 3-color indicator (red for aux, blue for Bluetooth, white for USB), containing a wired waterproof controller. PREMIUM 4 CHANNEL AMPLIFIER. Total power: 200 watts @ 4-Ohms, 50 Watts RMS x 4 @ 4-Ohms, stable for 4-8 Ohm loads. The power amplifier employs two TPA3116 chips. The TPA3116 is a high-efficiency Class D audio power amplifier chip designed by Texas Instruments and is commonly used in various audio devices. Class D design greatly minimizes power loss, making the amplifier highly efficient. Surplus energy is stored until required instead of being transformed into heat. Advantages include reduction in size and weight, decreased power waste, a smaller heat sink, and compact circuitry. Specifications: Dimensions: 7.7 x 4.8 x 2, Weight: 2.7 lbs