Master Clock Controller, Digital, 12 Hour, Shape Square, Width 6-3/8 In., Depth 3-1/2 In., Height 4-5/8 In., Digit Size 1/2 In., Power Source 110V, Mount Wall or Surface, Features Automatic time correction within 2 minutes of power restoration, Automatic daylight savings time adjustment, Battery backup, Schedules up to 300 events, Powers up to 8 bells and 20 horns, Case Material Plastic, Case Color Beige, Lens Material Polycarbonate, Connector Type RJ45, Interface Controller