Features: Process materials: highend black gold circuit board, imported audio capacitor, dualimported NICsper channel Adopting large capacity filter capacitors, domestic top tierbrands of single stone filter capacitors and metal film resistors. Specially customized black copperterminals, gold-plated audio input terminals, and customized3P black terminals. Power supply voltage: DC9-18V, recommendedpower: can be connectedto 4-8speakers, maximum2x35Wstereo (18V4) Input method: 3.5mm audio input/3Pexpansion input port protections: power input reverse protections, short circuit, overcurrent, overheating Suitable for upgrading or repairing car audio systems to enhancethe quality of music playback inside the car. Specifications: Item: TDA7377Audio Amplifier Board Power supply voltage: DC9-18V, recommended12V Output power: can beconnected to 4-8Speakers, withmaximumof 2x35Wstereo (18V4) Input method: 3.5mm audio input/3Pexpansion input port Protections: power input reverse protections, short circuit, overcurrent, overheating Size: approx 58.7x55.1mm/2.31x2.17in Potentiometer handle opening: 7mm Note: Due to the light and screen setting difference, the item color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package includes: 1PC TDA7377 Audio Amplifier Board