Feature: 1. TPA3255 Chip: This power amplifier board features the TPA3255 chip, with a wide voltage input of DC 16 to 38V and peak output power of 220Wx2 plus 350W. Customize the 10 band sound effects to optimize sound quality for various speakers. 2. High Gain: With a 30dB high gain, the amplifier board ensures effective high power output. The device also boasts advanced integrated feedback design and proprietary high speed gate driver error correction function (PurePathTM HD), maintaining ultra low distortion and high definition sound quality throughout the sound spectrum. 3. Memory Function: The amplifier board module remembers your last usage mode, ensuring that if you were in Bluetooth mode before powering the amplifier board, it will remain in that mode even when changing to AUX or USB. Selecting AUX or USB mode will maintain that setting from the previous use. 4. Treble and Bass Control: Tired of standard treble and bass settings? Adjust the treble and bass control knobs to create your desired sound. With AUX input, experience pure HIFI sound quality at your fingertips. 5. APP Control: Adjust sound effects, set Bluetooth name and password, manage sound prompts, and more through the app. Compatible for Android systems, the visual interface enables convenient control over playback modes, volume, sound effects, track selection, and playback functions. Specification: Item Type: Bluetooth Power Amplifier Board Material: PCB Sound Channels: 2.1 Channel Input Modes: Bluetooth, AUX, U Disk, USB Sound Card (Switch Modes and Songs with Dial Buttons) Adapted Power Supply: DC 16 to 38V ≥10A Adapted Speakers: Left and Right Channels 30 to 220W, 3 to 8Ω, Subwoofer 30 to 350W, 2 to 8Ω Bluetooth Version: 5.1 Voltage Gain: 30dB Protective Mechanisms: Anti Reverse Connection, Under Voltage, Overheat, Overcurrent, Short Circuit Prevention (Automatically Restored without Rebooting) APP: Supports for Wuzhi Audio Control. Package List: 1 x Amplifier Board 1 x Top Cover Board 1 x Bottom Cover Board 5 x Knob Caps 1 x Screwdriver 4 x M2x5+4 Copper Standoffs 8 x M2x4 Screws 4 x M2x18 Copper Standoffs