Door Window Sensor,Smart Home Antitheft And Antiintrusion Closed Objects,Entry Sensor, Detects Opened and Closed Doors or Feature: Multiple uses: Alarm sensors can be installed on front doors or, as well as on garage doors, liquor cabinets, front doors, safes, pet doors, etc. Make Your Doors and Smarter: When you leave home, if the doors and are opened or invaded by external objects, their 130 dB sound can scare away bad people. Compact and compact appearance: Reasonable size design and optimized internal structure bring you comfort, beauty, and enjoyment. Convenient installation: No difficult installation tools are required, installation is fast, low power gate sensors, ultra-long battery life, and frequent replacement is avoided. Door bell mode: Short press the SET key, and when a customer pushes the door in, the door magnet will ring Ding Dong Ding Dong... sounds, prompting someone to come in and out. Product parameters: Product type: Door Window Sensor Color: White Material: ABS Package size:7.5x5x2.5cm/2.95x1.96x0.98inch Gross weight:39g/0.08lb The Package Include: 1x Inductor 1x Instructions