Greencycle Window Alarm Sensors,Sliding Door Alarms when Opened,Alarm Door Left Open,Door Alarm Delay,110dB Loud Alarm,Easy Installation,4 Alarm Modes,Suitable for Fridge, Dormitory,Home,Shop,20PK

【Four-in-One Multifunctional Design】This door alarm combines four essential functions—alarm, continuous alarm, doorbell, and door-closing reminder—offering comprehensive security for your home or office. Whether it's deterring potential theft, reminding family members to close the door, or functioning as a daily doorbell, it caters to various needs, ensuring no detail is overlooked. 【Three Adjustable Modes】The door alarm refrigerator offers three customizable modes to suit your needs: continuous alarm mode, door closing reminder mode, and doorbell mode. The continuous alarm mode detects when a door or window is opened and sounds an alarm for 10 seconds. The door closing reminder mode activates when a door transitions from closed to open, sounding three prompt tones as a reminder. The doorbell mode detects when a door or window opens and emits a single prompt tone. These modes provide flexibility and convenience for various situations. 【Low Battery Warning Function】This fridge alarm features a built-in low-battery reminder. When the device’s battery is running low, it will automatically emit a warning sound to notify you to replace or recharge the battery promptly. This function helps prevent security risks caused by battery depletion, ensuring the alarm remains in optimal working condition and provides 24/7 protection for your safety. 【110dB Super Loud Alarm】Equipped with an ultra-loud 110dB alarm, this device effectively deters intruders and grabs the attention of those nearby, significantly enhancing the security of your home or office. The alarm is loud enough to be heard clearly, even at night or in quiet environments, ensuring timely alerts when needed. 【Easy Installation】Featuring an adhesive installation design, this door alarm requires no complex tools or wiring. Simply use the included double-sided adhesive tape to secure it in place. Ideal for various indoor environments, it can be easily installed on doors, windows, freezers, filing cabinets, and more.