Feature:1. Bluetooth Amplifier: High performance 2.1 channel 220W and 220W and 350W Bluetooth 5.1 amplifier board. It has multiple audio input methods such as AUX, Bluetooth, USB flash drive, and USB sound card.2. Efficient Work: A power amplifier with D level efficiency, which can bring true high end sound quality. This device has integrated feedback design and high speed gate driver error correction function, which enables the device to maintain ultra low distortion throughout the entire audio frequency band while providing high definition sound quality.3. Good Sound Quality: HIFI sound quality AUX audio connection, left and right channels, independent adjustment of high and low frequencies, 360 degree infinite tuning.4. Smart APP Control: The APP can display the playback mode, volume, sound effects, up and down song control, playback pause, playback mode, modifying Bluetooth name, and setting connection password.5. Wide Compatibility: 5.1 Bluetooth version, with higher transmission efficiency, more stability, and longer transmission distance. In open spaces, the wireless range can reach up to 15 meters. Widely applicable to various devices such as tablets, PCs, televisions, smartphones, laptops, etc.6. Safe Protection: The Bluetooth power amplifier board has multiple protection to ensure its safe operation. Equipped with static electricity protection, overcurrent protection, short circuit protection, and overheating protection.Specification:Item Type: Audio Power AmplifierProduct Material: PCBBluetooth vVersion: 5.1Input Method: Bluetooth, AUX, USB drive, USB sound card. Channels: 2.1 channels, left and right channels as well as bass channels. Volume Adjustment: high end encoder knob adjustment, smooth touch. Power Supply: DC 18-38V, 10AVoltage Gain: 30dBOutput Power: Left and right channels 220W, bass channels 350W. Adapted Speaker: Left and right channels 30-220W 3-8 , bass channels 30-350W 2-8 Protection Mechanism: Static electricity protection, overcurrent protection, short circuit protection, overheating protection. APP Function: Supports for YS Audio APP control. .Package List:1 x Audio Power Amplifier1 x Upper Cover Board1 x Bottom Cover Board5 x Knob Cover1 x Screwdriver8 x M2x4 Screw4 x M2x4 Standoff4 x M2x5+4 StandoffNote:1. Only when the audio signal input is large enough and the power supply voltage and current are large enough can there be sufficient output power. 2. The higher the power supply voltage, the greater the output power, the smaller the horn impedance, and the greater the output power. 3. Please ensure that the power of the adapter power supply is greater than the actual working power of the amplifier.