Alarm System: Designed for use with alarm systems. Great for use in family and factory window, door, etc. Easy to Install: With double-sides tape design that for easily install. Durable Material: Made of premium plastic material, it is durable and well made, high temperature resistant, not easy to deform, for long time use. Magnetic Switch Pattern: The switch is closed when the switch is close to the magnets, and the switch is open when the switch is separated from the magnets. Wide Application: Magnetic door touch reed switch great for door alarm sensor, alarm, LED switch, relay, low voltage devices etc. Effective for theft deterrence. Specification: Color: White Material: Plastic Size: Approx. 2.77x1.43x0.75cm/1.09x0.56x0.3inch Note: There might be a few color distortions due to different resolutions. There might be a slight error due to different hand measurements. Package Includes: 1 Set Alarm Switch. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.