Player introduction * turn on the power, player automatically play media files, 24 hours of loop playback, no standby mode, 1080p hd image output. * support for hdmi, av (cvbs composite signal) output. * support the connection of external 24 button control player media file playback process. * support the connection communication serial port rs485 command code control player media file playback process. Txt documents can be written play process. Instructions play, jump play, play stop, select the time to play... Can control the working state of the player by serial port rs485 You can create 99 folders, You can also pass the rs 485 directive the 99 folders to play.