GREENCYCLE 4 Pieces SF19R Wireless Entry Home Security Door Window Open Chime Doorbell, Burglar Alert Alarm, Tiny Magnetic Sensor Door Alarm for Home Garage Apartment Office Indoor Use Only - M-KS-SF19R-4PK

• [4 modes Alarm] General Magnetic Alarm: alarm is triggered when the door or window is opened.Constant Alarm: Once the alarm is triggered, even if the door or window is closed, the alarm will continue for at least ten seconds until the alarm is turned off.Closing reminder Alarm: When the door/windows is opened and not closed, alarm will be triggered to remind you to close the doors/window.Doorbell mode: When the door is opened, the alarm will emit a ding-dong sound to remind someone to enter. [Super Loud Alarm]Door/window anti-theft alert has up to 110lb LOUD alarm, scare off potential thieves effectively, also prevent children /pets going out the house without notice. [Widely Applicable]small size alarm suitable for window (sliding/crank/hung so on ), pool doors, refrigerator, drawer, freezers, interior door for kids safety. battery can last longer. [Easy operation]Press on/off 1/2/3/4 times to switch 4 modes Alarm, also press on/off switch to power on/off. Low consumption, battery can last longer. With low battery warning, if in low battery, it will sound "Du-Du-Du-Du". [Easy installation]Come with LR44 batteries and adhesive tape. Easily mount to windows or doors with included double sides adhesive tape, no tools required.