Features:brand new and high qualitySerial port instruction control. the same as the old chip(YX5300);UART TTL serial control playback mode. baud rate is 9600bps.30 class adjustable volume.Support sampling frequency (kHz):8 / 11.025 / 12 / 16 / 22.05 / 24 / 32 / 44.1 / 48Support file format:MP3/WAV. Package Includes:1x YX5300 UART Control Serial MP3 Music Player Module Specifications:Material: PCBSize:49x24mm/1.93x0.94inSupport sampling frequency (kHz):8 / 11.025 / 12 / 16 / 22.05 / 24 / 32 / 44.1 / 48Support file format:MP3/WAVSupport Micro SDHC Card30 class adjustable volumeUART TTL serial control playback mode. baud rate is 9600bpsPower Supply :3.2 ~ 5.2V for DC note:Please allow 1-2cm 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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.