Micro controller based systems, Bell ring time control,LCD display for easy programing, Stand alone unit. Applications: Schools, colleges, factory shift bell, industry shift bell (where scheduled bell rings are needed) Features: Daily 16 bell ring programs. User friendly programs (can be programed by an electrician). Manually over ride push button. Week day programing (15 day blocks). Volume control type bell ring time control. LCD Display for easy programing. Micro controller based systems. Battery backed memory for fit & forget operation(rusumes data up to 5 years) Stand alone unit (no need of computer)