1. Zero background noise decoding board: isolated design, ensuring no common ground noise, compatible with any amplifier, and quality.2. Convenient installation with magnetic suction: The bottom is equipped with a magnet that can be attached to the metal casing, making it more convenient and stable to use.3. Multi functional audio output: With a 3.5mm audio port, it supports direct connection to headphones or amplifiers, meeting needs.4. High performance power isolation: Input voltage 5V/3A, fully isolated design, improves performance and stability.5. Support APP control: Supports BT name change, password setting, firmware upgrade and other functions, easy to operate.Interface: TYPE-CInput voltage: 5V1-3AUSB decoding format: MP3WMA, Non destructive WAV/FLAC/APE 1411kbps/16bitBT decoding format: AACSupport modes: 5.1 BT decoding/USB/sound card/AUXAPP functions: change BT name, set password, set prompt tone size, firmware upgrade, USB flash list, sleep aid song, etc.Zero background noise, high reliability, high compatibilityFully isolated power supply, upgraded performanceProduct size: 54mm x 42mm x 24mmNote: the shell needs to be assembled by itself.Colour:As ShownMaterial:Plastic+MetalPackage Contents:1 * Amplifier Board1 * Case Combination kitOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.