90dB Home Door and Window Alarm with Wireless Magnetic Sensor for Home Security System and Child Safety - Burglar Detectors Battery Operated Sirens

Door and Window Contact Sensor: This magnetic door and window chime alarm sensor will emit a 90dB audible alarm if the door is suddenly opened. It can prevent your children from sneaking around. And it's a security wireless magnetic alarm, perfect for child safety, burglar, home, garage, mailbox and business security Easy to install: This kit Door/Window Contact Sensor Security Kit comes with self-adhesive pads, so no tools are required, just stick the alarm sensor onto a door or window. Can also be used as a door stop alarm, swimming pool door alarm, garage door alarm or sliding door alarm Fast automatic shutoff: With an ultra-sensitive magnetic sensor design, contact sensor kit can quickly detect the status of your door or window. Requires 3 AAA batteries (not included)