Features:Using original XY-AP15H chip, High power rejection ratio, high AM rejection, high power conversion efficiency4 audio input mode: Bluetooth / AUX / USB-C disk / USB-C sound cardApp control , it can be used to switch audio input mode / play mode / sound effectLeft+Right channel output (stereo)Support active and passive speakersProtection: anti-static , reverse polarity , short-circuit , over-heat , over-voltage , under-voltage, DC protectionParameter:Name: 20W+20W bluetooth amplifier board Model: XY-AP50HChip: 1 * XY-AP15H (Class D)Input voltage: DC 5-27V / 2A aboveBluetooth version: 5.0Channel quantity: 2 (Left+Right stereo)Audio input: Bluetooth / AUX / USB-C disk / USB-C sound cardOutput : LC filter output, high-definition sound qualityTransmission distance: more than 15meters (Unobstructed)Speakers range 10W-200W , 4/8Output power: 10W*2@12V,8 20W*2@12v,4 Package include:1Set Bluetooth Digital Amplifier BoardNote: The protection board and heat sink need to be installed by yourself