Features: brand new and high quality Adopt TPA3116D2(with AM interference suppression function) chip, with excellent sound quality. It ensures that even with high power operation for a long for time. Dual Channel stereo output power 50watt x 2, for working voltage range DC12-24V 2A 4/8 passive speakers . Our Bluetooth-compatible board for amplifier audio comes with dual channel which means the transmission efficiency is high and the transmission for path is wide. Support 3.5mm wired input, for high fidelity and powerful sound, with high transmission efficiency and wide transmission for path. With over-voltage for protection, under-voltage for protection, over-heat for protection, short-circuit for protection. for Ideal for DIY your passive speakers. Specifications: Product Name: TPA3116D2 Digital Power Amplifier Board Supply Voltage: DC12-24V Output Power: maximum 50Wx2 Track number: Dual Channel Stereo Product size:approx 89x60x21mm/ 3.5x 2.36x0.83in Material: ABS+ Alloy+Silicone Weight: 154g Note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. Package includes: 1x Digital Power Amplifier Board 1x User Manual