Check the listing for details. PYRAMID 41392 Signal Bell, 8" Diameter 1PB86. Condition: New. Listed at 208.96 USD. Signal Bell, Wall Mount, Shape Round, Case Material Steel, Case Color Putty, Connector Type Bell Wire, Voltage 24VDC, Width 8 in, Depth 3 1/4 in, Height 8 in, Overall Dia. 8 in, Features Durable Steel Casing, High Decibel Output (83 Db @ 3 M), Lunches, Breaks and Dismissal Time, Signaling for Shift or Class Changes, Wall Mountable, For Use With 1PB82, 2LMU7, Includes 8 in Bell, User Guide Use this wall-mount signal bell with Pyramid Master Clock Controller No. 1PB82, available separately, to improve employee accountability and productivity. It has a durable steel case, and can be used in K-12 schools to standardize class changes and bus waves. Other suitable environments for use include manufacturing plants, distribution centers, and correctional facilities.