Feature: 1. 【High-Power Output & Customizable Sound Quality】: Features dual 30W power output channels with adjustable bass and treble controls, allowing users to fine-tune the sound quality for optimal listening experience through different speakers. 2. 【Versatile Connectivity Options】: Supports BT 5.1 connection, AUX input, USB playback, and USB audio interface for connecting a variety of devices, including smartphones, tablets, computers, and MP3 players, ensuring high integration with various audio systems. 3. 【Multiple Protective Mechanisms】: Multiple protections design, includes overheat, overcurrent, short-circuit, and antistatic protective functions, ensuring smooth operation and prolonged lifespan. 4. 【User-Friendly APP Design】: Equipped with a mechanical knob for intuitive volumes control, and an APP for intelligent settings such as BT name and password customization, sleep timer, and customizable sound effects. 5. 【Convenient U Disk Playback & Power Management】: Offers U disk playback functionality with playlist support and song selection via shake, along with a power-saving auto-off feature to avert unnecessary energy consumption and overuse. Specification: Name: Power AmplifierMaterial: Printed circuit board + metalBT version: 5.1Power output: left channel 30W + right channel 30WAudio input: BT+AUX+USB+USB soundcardAdaptive powersupply: 9-24 V, ≥3A (No AC connection)Protections: overheating, overcurrent, short circuit, antistaticCharacteristic function: Support APP function. Modify the BT name, password setting, volumes adjustment of prompt tone, on/off prompt tone, sleep aid song, sound effect selection+custom sound effect, and U disk playlistAdapting horn: 10-50W 4-8ΩItem size: 60 * 76 * 20mm / 2.36 * 2.99 * 0.79inItem weight: 61g / 2.15ouncePackage size: 115 * 70 * 50mm / 4.53 * 2.76 * 1.97inPackage weight: 106g / 3.74ounce Package List: Packing List:1 * Power Amplifier