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This is a mini audio amplifier equipped with TPA3116D2 amp IC,50W+50W stereo sound output. On-board volume adjusting potentiometer knob, 3.5mm audio input jack, screw terminal wire connector, easy to connect the cable and audio volume control perfect for DIY HiFi stereo speakers. Specifications: Working Voltage: DC5V-24v Output Power: 50W+50W Working Frequency:20Hz-20Khz Module Size: 84 X 51 X 29mm/3.31 X 2.01 X 1.14inch(L*W*H) Package Included: 1X TPA3116D2 2X50W Class D Stereo Digital Audio Amplifier Board Note:1. The audio output should not short circuit to each other or to the ground. 2. The power supply should not over 24V