AP21-BH1 "Plug and Play" Extra Loud Break Buzzer System Plug and Play Buzzer System pre-wired with 100 feet of cable to a 4-inch Buzzer - No Wiring Required Single Schedule System with up to 30 Buzzer Sounds per day, as long as all 5 or 7 days of the week are the same Alpha-Numeric display with Positive Action Keyboard for Fast and Simple Programming Covers up to 25,000 square feet Two Year Warranty