Features: brand new and high quality The TPA3255 Chip Solution: Stereo Dual-channel Output to Ensure Continuous Serial High-power Operation, This power amplifier board uses two TPA3255 high-fidelity maximum output power up to 220Wx2+350W. Treble & Bass Control:If you are tired of an amplifier with only one volume knob, then you feel right, because you have further requirements for audio. By adjusting the high and low frequency knobs of the power amplifier board, you can make the sound more layered and make the bass more shocking. High Compatibility:The DC adapters on the market basically can meet the needs of the Bluetooth-compatible power amplifier board. Protection Function: Bluetooth-compatible power amplifier board has multiple protection mechanisms to ensure its safe operation. It has short-circuit protection, over-current, over-heat, and anti-reverse protection. After-sales Service: If You Have Any Questions About The Product, or The Product Has Quality Problems, Please Contact Us. Specifications: Product name: 2.1 channel Bluetooth-compatible audio power amplifier board Power supply: DC12-38V/10A Bluetooth-compatible version: 5.1 Audio channel: 2.1 channel Audio input: Bluetooth-compatible + AUX + U disk + USB sound card Audio output: left and right channels + subwoofer Frequency range: 20HZ-20KHZ Volume adjustment: high-end encoder knob adjustment, smooth feel The left and right channels are up to 220W/3Ω--36VDC Large output power: 175W/4Ω--36VDC 100W/8Ω--36VDC Subwoofer maximum 355W/2Ω--36VDC Output power: 250W/3Ω--36VDC 195W/4Ω--36VDC Protection mechanism: protection against overvoltage, undervoltage, clipping, short circuit, overheating, etc. Product size: approx. 133x130x25mm/5.24x5.12x0.98in Package Includes: 1PC x 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!