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 (83 dB @ 3 m) 24V DC Durable Steel Casing Wall Mountable For Use With 1PB82 2LMU7 Includes 8 in 24V DC Bell User Guide