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TPA3116 4.1 Class D Power Stereo Amplifier Board With Bluetooth 4x50W+100W - Arduino Compatible SCM & DIY Kits Module Board - , , , , , , , , 1 x TPA3116 HIFI Digital Amplifier, , , , , , , , , , , , Specification: Model: TPA3116 Efficiency: 90% Work style: D class Static electricity: 80 mA The rated power output: 4 x 50 W+ 100W Frequency response: 20 Hz to 20 KHZ Working voltage: 18V to 24V The output current: 2 A Size(L*W*H): 165 x 130 x 20 mm Features: Potentiometer function: from left to right 1. Bass volume 2. Front left and right channel volume 3. Rear left and right channel volume 4. Total volume 2.0 Signal input 4.1 Power output Package includes: 1 x Bluetooth Power Amplifier Board