Features: Brand new and high quality Support MP3 WAV high-quality audio format with beautiful sound. 24-bit DAC output, dynamic range support 90dB, signal ratio 85dB. Support two-wire serial port control, AD control. USB update voice files, no need to install drivers, no need to install software, direct copy, fast and convenient. Support XP series System, WIN7, WIN8, WIN10 system. Support the control of common functions such as previous song, next song, play, pause, stop, song selection, etc. Support free combination play. Support 30-level volume adjustment. Support cycle times setting, more applications, more user-friendly. Dedicated BUSY signal output indication. Mature instructions and instruction analysis make the application more stable. Dedicated supporting upper computer, quick to get started, easy to debug, and instructions are automatically generated. Specifications: Material: PCB Note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x MP3 Player Sound Module