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KNACRO 2-Channel Bluetooth Amplifier Board 6W +6W Bluetooth Speaker Modified Board DC5V Power Supply Can Be Connected To 3.7V Lithium Battery-powered, With charge management circuit : Amazon.in: Electronics
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SANWU TPA3116 2X50W Bluetooth 4.2 5.0 USB microSD Dual-CH Amplifier
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Wireless Bluetooth 4.0 Audio Digital Amplifier Boa from elecseller on Tindie
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Wireless Bluetooth 4.0 Audio Digital Amplifier Boa from elecseller on Tindie
SANWU TPA3116 2X50W Bluetooth 4.2 5.0 USB microSD Dual-CH Amplifier