High Sensitivity: Magnetic sensor switch detects door or window openings. The alarm sounds when a window or door is opened, providing immediate alerts. Ultra-Loud 108 Decibel Alarm: Emits a powerful 108dB alarm to deter intruders and alert homeowners when doors or windows are illegally opened. Supports Multiple Modes: Features general alarm, constant alarm, door closing alarm, doorbell mode, and closing or deactivation. Easy to Install and Use: Window alarm sensor installs easily onto windows or doors with double-sided tape, no tools required. Door Alarm: The magnetic door sensor is an ideal entry alert for homes, apartments, RVs, offices, hotel rooms, garages, and more. Item Type: Door Window Alarm Material: ABS Alarm Volume: 108 DB Battery Life: Standby time over 2 years (based on 5 switches per day) Alarm Batteries: AAA x 2 (not included) Working Temperature: -10℃ to +60℃ Working Humidity: R/H <80% Storage Temperature: -20℃ to +70℃