Product Name: Mini 50W+50W Stereo Bluetooth Digital Amplifier BoardProduct model: -AP50LBluetooth version: 5.1Transmission distance: 15 meters (unblocked) supply: DC12-24VNumber of channels: left and right channel (stereo)Adapter speaker: 30W~-200W 4 8 16Protection mechanism: reverse connection protection, short circuit protection, self-recovery overheating protectionUnique function: support Audio-APP controlNote: The output of the supply should be greater than the output of the amplifier, otherwise it will affect the sound quality12V-8/15W+15W, 4/20W+20W15V-8/18W+18W, 4/ Greater than 30W+30W19V-8/32W+32W, 4/ Greater than 45W+45W24V-8/40W+40W, 4/ Greater than 50W+50WMaterial: PCB+Metalcolour: blackPackage Contents:1 x digital amplifier board1 x DC adapter1 x screwdriverOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.