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
Audio Amplifier Board Wireless Bluetooth Audio Receiver Power Amplifier Board Module : Amazon.in: Electronics
TDA7492P Audio Power Amplifier Board Bluetooth-compatible CSR4.0 Audio Receiver Amplifier Board Module Parts DC 8-25V