Welcome to our store! Stereo Dual Channel Output: Ensures continuous serial high-power operation, wide voltage input DC12‑24V. This high-quality power amplifier board has a maximum output power of up to 50W x 2+100W. Bass is more powerful: If you are tired of an amplifier with a single volume knob and have additional sound requirements, adjust the high and low frequency knobs on the power amplifier board to make the sound more layered and the bass more impactful. Including DC Converter Connector: The DC adapter on the market (connector size 5.5mm x 2.1mm) can basically meet the requirements of the Bluetooth power amplifier board. If your existing DC power connector is not 5.5mm x 2.1mm, no problem, we include DC converter connectors in the product. Multiple Protection Mechanisms: The Bluetooth power amplifier board has a variety of protection mechanisms to ensure safe operation. With short circuit protection, overcurrent protection, overheating protection, and anti-reversal protection. When an overload occurs, the device reports the fault to the processor to protect itself from damage. Mobile APP Control: Supports smart phone control, APP visual operation, playback mode, volume, sound, up and down song control, playback pause, playback mode to change the Bluetooth name, and set the connection password. Item Type: Digital Audio Power Amplifier Module Weight: 190 g/6.7 oz Product Material: PCB Bluetooth Version: 5.1 Input Mode: Bluetooth and AUX and U disk and USB sound card Number of Channels: 2.1 channels (left and right channel and woofer) Volume Adjustment: Advanced adjustment of the encoder knob, feels smooth Power Supply: DC12-24V ≥8A Input Sensitivity: 500mV Output Power: left and right channel ≤50w, subwoofer ≤100W Adaptive Horn: Left and right channel: 20-50W 4-8Ω Subwoofer: 20-100W 4-8Ω Protection Mechanism: overvoltage, undervoltage, overheating, DC detection, short circuit protection APP Support: for YS Audio APP control 1 x Power Amplifier Board 1 x Upper Cover Plate 1 x Lower Cover Plate 5 x Knob Cap 1 x DC Adapter 4 x M2x16 Copper Pillars 9 x M2X3 mm Screws 4 x M2X3+3 Copper Pillars 1 x Screwdriver Customers are our top priority. If you find any problems with your product after receiving it, such as damage or incorrect quantity, please contact us immediately. We strive to provide you with the best after-sales service.