Door Alarm When Opened (2 Pack), Greencycle Door and Window Alarm for Home, Door and Window Open Sensor, 4 Alarm Mode 110 dB for Garage Kids Safety Refrigerators Apartment Garage Home Office

【4 Alarm Modes】General Magnetic Alarm: Triggers when door or window opens. Constant Alarm: continues for no less than 10 seconds although door or window is closed. Closing Reminder Alarm: Reminds to close door or window if left open. Doorbell Mode: Emits ding-dong sound when door opens.
【Low Battery Alert】Door alarms for home security system has low consumption which battery can last more. With low battery warning, It’ll sound “Du…” for 0.5 seconds when the battery is low. It’ll sound “Du…Du” twice each 30 minutes when a low battery is detected in normal operation.
【Super Loud Alarm】This door window alarm can instantly detect any movement in your door or window. Door window anti-theft alert has up to 110lb loud alarm, scare off potential thieves effectively, also prevent children or pets going out the house without notice. Also ideal to prompt you when elder, guests or sleepwalker are opening the door.
【Easy Installation】No wiring needed! No screws needed! Included double sided tape! Window burgalar alarm come with LR44 batteries and adhesive tape. Window securtiy alarm will also be easily mounted with adhesive tapes. Easily mount to windows or doors with included double sides adhesive tape. Note: Make sure the gap between the alarm and magnet sensor within 0.39inch.
【Wide Applicable】Door alarm sensor suitable for window (sliding/crank/hung so on), pool doors, refrigerator, drawer, freezers, interior door for kids safety. Whether it’ s your children, home, garage, mailbox or businesses – We need to allow you to stay safe. Also ideal entry warning for your home, office, apartment, garage and so forth.