100% New and high quality | Easily mounted by adhesive. Type to window or door. Ideal entry warning for homes,apartments,mobile homes,offices,hotel rooms,garages,and more！ | Magnetic sensor switch detects your door or window. | Super loud 95 dB alarm.When someone opens the door or window illegally (the relative position of the primary and secondary parts changes), the alarm can issue a strong alarm, warning the intruder to leave and remind the owner | Super suitability and stability.

【Easy to use & User description】 Magnetic sensor switch detects your door or window. Easy stick installation and operation. It only takes 3 steps：1. insert 2 PCS AAA battery (battery do not contain in the box), 2. tear the double-sided adhesive on the backpack, paste the door knob alarm on your target position， 3. press on/off switch to power on/off. Note: When the distance between the doorbell and the magnetic sensor is greater than 0.59 inches, the doorbell will emit a sound of 90 decibels or more, to alert you or drive away thieves and protect your children | 【Applicable to multiple scenarios】 Easily mounted by adhesive. Type to window or door. Ideal entry warning for homes,apartments,mobile homes,offices,hotel rooms,garages,and more！ | Super loud 90 dB alarm. When someone opens the door or window illegally (the relative position of the primary and secondary parts changes), the alarm can issue a strong alarm, warning the intruder to leave and remind the owner | Super suitability and stability.100% New and high quality | 【Package include 】It comes in 10 packs Door window alarm, stable and dustproof.