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USB motion sensor sound module  bluetooth 3W stereo speaker PCBA with waterproof loudspeaker  4ohm 15W mono FM amplifier board @12V  110-230V bluetooth amplifier 2*3W with compact white case  2 X 150Watt @4ohm Class-D Audio Amplifier Board  High End TPA3116 Bluetooth Amplifier Board 2*50W+100W  TA2024 bluetooth amplifier board 2*15W @4ohm  bluetooth audio amplifier MAX 2*20W larger board with connectors  Digital 50W mono amplifier module 
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