Sanjie Door Alarm with Instant and Delayed Alerts 30s/1min/2min/4min, Door Window Ajar Alarms for Kids Safety/Home Security, Volume 0-120dB, Left Open Alert for Freezer Fridge Home, 2 Sensor

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About This Door Alarms When Opened: The door alarm sensor features both instant and delayed alert functions. It offers two ringtones: Siren Alarm/Chime: di di di.... It alerts you when the door is opened or door left ajar, for total peace of mind at home and work Easy Installation and Setup: Tear off the 3M tape on the back of the alarm sensor and firmly stick it to doors, windows, or other objects. Or install using the screws provided.Select alarm or chime mode, set your preferred alert timing mode, and begin use.Indoor installation is recommended(Note: Installation distance between sensor and magnet strip: Non-metal doors Show more