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-C Input voltage: 5V 1-3A USB decoding format: MP3, WMA, WAV, FLAC, APE 1411kbps/16bit BT decoding format: AAC Support modes: 5.1 BT decoding, USB, sound card, AUX APP 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 compatibility Fully isolated power supply, upgraded performance Product size: 54mm x 42mm x 24mm Note: the shell needs to be assembled by itself. Color: As Shown Material: Plastic + Metal Package Contents: 1 x Amplifier Board 1 x Case Combination Kit Only 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.