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Marine Bluetooth Amplifier with a 3-color indicator (red for aux, blue for Bluetooth, white for USB), comes with a wired waterproof controller. PREMIUM 4 CHANNEL AMPLIFIER. Total power: 200 watts @ 4-Ohms, 50 Watts RMS x 4 @ 4-Ohms, 4-8 Ohm Stable. This power amplifier utilizes dual TPA3116 chips. The TPA3116 is a high-performance Class D audio power amplifier chip designed by Texas Instruments and commonly used in various audio devices. Class D - Power loss is greatly minimized, resulting in a highly efficient amplifier. Surplus energy is stored for later use rather than being transformed into heat. Advantages comprise a reduction in size/weight, less power waste, a smaller heat sink, and compact circuitry. Specifications - Dimensions: 7.7 x 4.8 x 2, Weight: 2.7 lbs