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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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TDA7492P 50W+50W Digital Amplifier Board CSP8635 Bluetooth 4.0 Chip BT Audio Receiver Amplifier Board Module Parts - AliExpress
Mini digital power amplifier board USB5V power supply dual channel stereo 3W import PAM8403 power amplifier
SANWU TPA3116 2X50W Bluetooth 4.2 5.0 USB microSD Dual-CH Amplifier