Description: Super sound quality, onboard 2W mono amplifier, directly connected to the horn, 3.5mm gold-plated headphone jack can be connected to headphones or external speakers. With MicroUSB power supply interface, can also be used 3.7V lithium battery, USB 5V power supply. Support TF card (inside the phone memory card), U disk play mode. With horn terminal blocks without welding, easy wiring. Supports MP3 format, auto-play on power-up, red LED indicator update during playback. Convenient to wire and refit; 4 buttons on the board for setting operation. Specification: Name: mp3 lossless decoder board (supports TF card/U disk) Power supply range: 3.7~5.5V color: blue Size: 45*34*8mm/1.77*1.34*0.31'' Material: PCB panel Package Includes: 1x Mp3 lossless decoder board