Features:100% brand new and high qualityAdopt TPA3116D2(with AM interference suppression function) chip, with excellent sound quality. It ensures that even with high power operation for a long 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 path is wide.Support 3.5mm wired input, high fidelity and powerful sound, with high transmission efficiency and wide transmission path.With over-voltage protection, under-voltage protection, over-heat protection, short-circuit protection. Ideal for DIY your passive speakers. Package Includes:1x Digital Power Amplifier Board1x User Manual Specifications:Product Name: TPA3116D2 Digital Power Amplifier BoardSupply Voltage: DC12-24VOutput Power: maximum 50Wx2Track number: Dual Channel StereoProduct size:approx 89x60x21mm/ 3.5x 2.36x0.83inMaterial: ABS+ Alloy+SiliconeWeight: 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.