Product Name: HIFI-level Edition 50W+50W Stereo Bluetooth Digital Amplifier BoardProduct model: -C50HBluetooth version: 5.1Output mode: LC filter output, high-definition sound qualityTransmission distance: 15 meters (unblocked) supply: DC12-24VNumber of channels: left + right channel (stereo)Input : Bluetooth+AUX+U disk+USB sound cardVolume adjustment: using the encoder used in high-end speakers, the infinite tuning feels smooth and one-key start and stopHeat dissipation : pure aluminum heat sink + shell heat dissipation, heat dissipation area, to high-performance operation with sufficient Adapter speaker: 10W-200W/4-8Volume adjustment: high-end encoder knob adjustment, smooth feelProtection mechanism: anti-static, anti-reverse supply, short circuit, overheating, overvoltage, undervoltage, DC protectionUnique function: support Audio-APP controlProduct size: 76 x 52 x 19mmOutput : 10W*2@12V, 8; 20W*2@12V, 4; 20W*2@18V, 8; 40W*2@18V, 4; 30W*2@22V, 8, 50W*2@21V, 4color:BlackMaterial:PCB+MetalPackage Contents:1 x 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.