Signal Bell Wall Mount Shape Round Case Material Steel Case Color Putty Connector Type Bell Wire Voltage 24V DC Width 8 In. Depth 3-1/4 In. Height 8 In. Overall Dia 8 In. Features Signaling For Shift Or Class Changes Lunches Breaks And Dismissal Time High Decibel Output (83Db @ 3 Meters) 24 Volt Dc Durable Steel Casing Wall Mountable For Use With 2LMU7 1PB82 Includes 8 in 24V Dc Bell User Guide