Welcome to our shop. We provide you with the best service. This is the best gift for yourself and your family and friends. Our store operates in good faith and is updated from time to time. If necessary, you can bookmark and follow, so as not to miss the new one. Description: Size(approx):6*6*1.6cm Color:black Material:plastic Package includes: 1Set Bluetooth Digital Amplifier Board Features: Using original TPA3116D2 chip, High power rejection ratio, high AM rejection, high power conversion efficiency 4 audio input mode: Bluetooth / AUX / USB-C disk / USB-C sound card App control , it can be used to switch audio input mode / play mode / sound effect Left+Right channel output (stereo) Support active and passive speakers Protection: anti-static , reverse polarity , short-circuit , over-heat , over-voltage , under-voltage, DC protection Parameter: Name: 50W+50W bluetooth amplifier board Model: XY-AP50H Chip: 1 * TPA3116D2 (Class D) Input voltage: DC 5-27V / 2A above Bluetooth version: 5.0 Channel quantity: 2 (Left+Right stereo) Audio input: Bluetooth / AUX / USB-C disk / USB-C sound card Output : LC filter output, high-definition sound quality Transmission distance: more than 15meters (Unobstructed) Speakers range;10W-200W , 4omega /8omega Output power: 10W*2@12V,8omega 20W*2@12v,4omega 20W*2@18V,8omega 40W*2@18V,4omega 30W*2@22V,8omega 50W*2@21V,4omega Note: The product is measured by hand and may have an error of 0.1 cm and 1 cm. Due to factors such as photographic equipment, the actual items may differ from the pictures, please understand. Have a pleasant shopping experience and have a pleasant life,Thank you.