Description: It adopts TPA3116D2 chip, 2 channel stereo output power and 3.5mm wired input and bluetooth 5.0 input. This bluetooth amplifier board has a bottom plate and a top plate, which supports reverse connection protection, over-voltage protection, under-voltage protection, over-heat protection, and short-circuit protection. Made of high quality ABS plastic, aluminum and copper, it is durable and safe to use. The length of the product is 11cm, the width is 7cm, and the height is 2.1cm. It is suitable for home passive speakers. Item Name: Stereo Amplifier Board Material:Copper,Aluminium,Fiberboard Style: Modern Type: Standard Output Power: 50W x 2 Output Impedance: 4 Ohm-8 Ohm Output Ripple Noise: >90dB Power Requirements: DC9~24V/2A Channels Number: Two Size:15cmx10.2cmx3.8cm/5.91inx4.02inx1.5in Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 X Wire 1 X Screw Driver 1 X Audio Power Amplifier Board