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TPA3116 Dual channel 2*50W, high efficiency and low-heat, Applicable Speaker Impedance: 4,6,8 ohm Audio input: 1. Bluetooth audio reception 2. USB decoding playback 3. TF card decoding Decoding support playback formats: MP3, WMA, WAV, FLAC; This Bluetooth audio receiver board is able to give your amplifier/home stereo bluetooth capability, just a very simple operation can be converted into wireless audio. Power supply: 24V DC / 3A; Size: 85mm x 52mm Additional features: with FM Radio , remote control to receiver (infrared mode)