Wireless Door Opening Alarm with Time Delay Sensor

4-in-1 Multi-Function Alarm: General Alarm, Constant Alarm, Closing-Door Alert (Time Delay), and Doorbell<br> Powered by 2 AAA batteries (batteries not included)<br> Self-adhesive design for easy installation and operation<br> 108 dB loud alarm for enhanced security<br> General Alarm Mode: Sounds when doors or windows are opened; stops when closed<br> Constant Alarm Mode: Sounds continuously once triggered<br> Time Delay Mode: Emits a “beep-beep-beep” sound 15 seconds after doors or windows are opened (adjustable delay options: 3/15/30/60 seconds; factory default is 15 seconds) — ideal for use with freezers or refrigerators<br> Material: ABS<br> Color: White<br> Package Includes: 4 x Door/Window Alarms, 4 x Magnetic Strips, Double-Sided Adhesive Stickers, User Manual<br> Note: Color appearance may vary slightly due to lighting and screen settings. Measurement tolerance: ±1–3 cm.