Manual Door Chime will notify you of the entry or exit of customers. It also helps control access to storeroom. The Manual Door Chime installs on the door frame. The door must be metal or have metal on it, for the unit to work. A plunger with a magnet end sticks out of the chime box & sticks to the metal. As the door is opened, the plunger is pulled, until the force is too much for the magnet. This causes the plunger to retract back inside the box where it strikes a metallic plate, producing a loud, but gentle "ding" sound. . No Batteries or electricity required.
