Bluetooth Stereo Amp specs:

Bluetooth version 5.0

Bluetooth Connection Distance:  15 metres (visible)

Voltage 12 volt

Output power 20W + 20W

Output load 4 - 8 Ohm (4 Ohm recommended)

Frequency response range 14-100KHz

Signal -to-noise ratio: 100db

Thermal protection

Short Circuit protection

Reverse Polarity protection