​Description:This audio amplifier board, with Bluetooth 4.0, can support all versions of Bluetooth connection stereo input. It will automatically goes into pairing mode after power on, and you can search display device name: SANWU Audio to connect.Features:Automatically goes into pairing mode after power on.Support all versions of Bluetooth connection stereo input.Switch is convenient and can adjust power amplifier gain directly.Can drive speakers with bigger damping.Sound quality is good, big power.Specifications:Power Supply: 2.1 interface, DC 8V ~ 25V (make sure polarity is correct, otherwise chip will burn)Audio Input: All versions of Bluetooth connection stereo input, using CSR8635 Bluetooth chip, Bluetooth 4.0, good compatibility.Output Impedance: 8ohm is best (can drive 4,6,8,16ohm speaker)MAX Output power: 50W + 50W (Powered 25V,6-ohm impedance output 2 x 50W )Weight: 38g(approx.)Size:8.20 x 5.0 x 1.0cm/3.23 x 1.97 x 0.39 in.Package included:1 x Audio Amplifier BoardNO Retail Box. Packed Safely in Bubble Bag.