Feature: 1. Magnetic Sensor Detection: The wireless magnetic induction switch can monitor the open or closed status of door and window, the induction range is approx. 8‑15mm/0.3‑0.6in 2. 130 Db Alarm: When someone illegally opens the door or window, the alarm will immediately emit 130 dB siren to warn the intruder to leave and remind the owner 3. Adjustable Alarm Sound: This door and window alarm has three tones, the volume can be adjusted, and the alarm can be delayed for 30 seconds 4. Easy Installation: This door window alarm can be easily mounted on window and door with adhesive, firm and not easy to fall off 5. Application: This door window alarm suitable for home, apartment, mobile home, office, hotel room, garage and etc. Specification: Item Type: Door Window AlarmMaterial: ABSBattery: 3 x Button Battery LR44 1.5V 140mah(Built in)Working Temperature: -10°C-50°CVolume: 130DBInduction Range: Approx. 8-15mm/0.3-0.6inStandby Time: About 1 year . Package List: 1 x Door Window Alarm(Battery built in)1 x Magnetic Strip1 x Double Sided Tape