Features: Brand new and high quality Volume adjustment: high-end encoder knob adjustment, smooth feel. Protection mechanism: overvoltage, undervoltage, overheating, DC detection, short circuit protection. Note: When the audio signal input is large enough and the power supply voltage/current is large enough, there will be enough output power! The higher the power supply voltage, the greater the output power, the smaller the horn impedance, and the greater the output power! Please ensure that the power of the adaptive power supply is greater than the actual working power of the power amplifier! Specifications: Working voltage: DC12-15V 1-4A Amplifier channel: 2.1 channels Bluetooth version: 5.0 Output power: 80Wx3 Operational amplifier integration: 4558 Size: 120x130x50mm Package Includes: 1PC x High Power Amplifier Board note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!