Liftmaster 50510 Alarm Bell 4 in 115v Audible/Visible Warning Devices
Warning Bell:
Auxiliary limit switches or auxiliary contact blocks to control warning devices may be added to the operator at the time of order (see door operator modifications) to allow for connection of warning devices. For further information, contact your LiftMaster sales representative.
WARNING: It is strongly recommended that audible/visible warning devices be included in every operator installation.
