1. Using the latest materials to develop high-power Bluetooth digital power amplifier board 2.1-channel high-fidelity sound quality 2. The working voltage range is 18-50VDC, and the limit is 53V. It is recommended to use a DC power supply with a voltage of 36-48V and a current of 12A or above. 3. Left or right channel-300W@50V, 4Ω; 160W@50V, 8Ω Maximum power subwoofer 600W@50V2Ω; 300W@50V, 4Ω160W@50V, 8Ω In short, the higher the voltage, the smaller the resistance, the greater the output power 4. Input undervoltage, overheating, overcurrent, short circuit protection. No input anti-reverse connection protection, positive and negative poles cannot be reversed Product Description Type: power amplifier board Model: AS21P Supply Current: Standard Power: standard Usage: standard Specifications: integrated potentiometer AS21P, external potentiometer Product name: 2.1 channel bluetooth power amplifier board 300W+300W+600W Product model: ZK-AS21P Bluetooth chip: Jerry 5.1, transmission distance 15 meters Input method: Bluetooth+AUX+U disk sound card Number of channels: 2.1, left and right channels + subwoofer Power amplifier chip: two TPA3255 Product size: Potentiometer external: 13.15 x 12 x 4cm Product weight: Potentiometer external net weight 453g Material: ABS colour: brown Package Contents: 1 x Potentiometer external AS21P