Magnetic / Mechanical plunger Door Entry Chime
These type Door Entry Alert Chimes require no batteries. Half of the device mounts on the door and the other half on the door frame; when a customer opens the door a magnetic plunger is pulled back until it releases and plunges into a mechanical chime. The Entry Chime Alert sound is made in the device, at the location of the sensor.
Mechanical Entry Chimes have been designed to operate magnetically. As the door is opened, the chime magnet pulls away from the door frame, causing the magnetic striker to hit the chime bar which makes a pleasant audible sound. The entry chime can be used on doors that opem in or open out and can be used with wood or metal door frames - fits all types of doors and jambs. No batteries or electricity required!