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DROK Bluetooth Amplifier Board Product Parameter: Operating Voltage: DC 4.5-27V Output Power: 50W*2 Signal-Noise Ratio: 102dB 2 Audio Input Ways: 1. Directly connect this bluetooth speaker board with wireless Bluetooth 3.0/4.0/4.1. 2. Headphone (Line in). 2 Powering Methods: The digital amplifier module is equipped with wiring blocks and DC 2.1mm socket which is compatible with most laptop's power port. Protective Functions: Reverse connection protection, over-voltage protection, under-voltage protection, over-heat protection, short-circuit protection. Package Includes: 1x 50W*2 Bluetooth Amplifier Board