School Automatic Ringing Bell System AUTOMATIC SCHOOL BELL RINGING SYSTEM (Model – Advance) SALIENT FEATURES: 1. MICRO-SD CARD MOUNTING FACILITY: User’s choice sound files can be uploaded and played as Bell sound or as pre-recorded message at user programmable time schedule. 2. SOUND FILE FORMAT : Sound files can be of Mp3, WAV or WMA format. 3. PRE-LOADED SOUND: Micro-SD card will come with pre-loaded sound files in female voice narrating “Period No. 1, Period No. 2, Lunch Time” and like wise. Etc.