Only 50 x 35 mm small, this little amplifier board is extremely powerful.
Without additional cooling (heat sink) it can crank out 2 x 20W on 4 Ohm Speaker (with 20V power supply).
The maximum operating voltage range is 8-24V, the minimum Speaker impedance is 4 Ohm.
It has controls for volume and pause/resume on board (single knob).
After connecting power to the board, it automatically starts pairing with the last know device, or can connect to a new device right away.
It also features several safety features like short circuit protection, overload protection, and thermal protection.
For the maximum output power of 2 x 30W is an additional heatsink required.