1、The decoder has 4 buttons with a power switch, and has the functions of card reading USB/memory card, FM radio, and AUX. 2、It supports USB/SD/FM/LINE/automatic switching, andontains MP3/WMA/lossless WAV song decoding chip. 3、The decoder supports folder playback (convenient for different music categories to choose and play: in the playback state, long press the mode MODE on the remote control, the screen will display F01 and F02 at the same time. 4、Support 2.0USB/SD card switching, previous song, next song, volume adjustment, EQ, play/pause, single/full song/random/folder repeat, mute, shutdown, direct song selection. Support for FAT file system. 5、The MP3 decoder board supports MP1Layer3, MP2Layer3, MP3Layer3 version of songs. MP3 songs 32‑320kbps songs. Lossless WAV is below 1411kbps for two channels. 6、Support the power‑off memory function, which can memorize the songs and volume played before the power‑off. 7、Support loop mode playback (long press the player): single loop (ONE)/folder loop (FOL)/full loop (ALL); if it is pressed to (FOL) in the current folder, it will only be in this folder The whole song is played in a loop. 8、Suitable for 2.0, 2.1 or 5.1 speaker power amplifier board. Turn on the AUX audio input status, if there is a card on the product or the U disk is powered on, it will play music directly. Item Type :Decoder Material: PCB Working Voltage: DC 5V/12V (only one can be selected, and two sets of power supplies cannot be connected at the same time) Working Current: 600mA-800mA Output Amplitude: >700mV Panel Size: Approx. 92x35x31mm / 3.6x1.4x1.2in Hole Size: Approx. 75x27x31mm / 3.0x1.1x1.2in Spacing of Fixing Screw Hole : Approx. 80mm/3.15in Battery: 1 x CR2025 1 x Decoder 1 x Power Cable 1 x Connection Line