2 50W Bluetooth 5.0 Amplifier Board TPA3116 Amplifier 2 Channel Power Amp Stereo w/ Tone Knobs. 21V /8Ω> 30W x 2; 21V /4Ω = 50W x 2;. - Bluetooth Receiving Distance: > 8m (Bluetooth version 4.2). Power on: Default Bluetooth mode, is waiting for the Bluetooth audio device to connect.
eBay