Personal Security Window & Door Alarm Bell | Wireless Sensor Door Window Burglar Alarm | Pack of 10

【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