Jenix New and high quality Door Window Alarm set of 4 .Small and exquisite, easy to install, easy to stick with the double-sided adhesive. The standby time of 3 * 1.5V LR44 button battery (included in the machine) can be up to one year, and the replacement is convenient. Simply glue the main and auxiliary parts to the door and door frame or two windows and align them. Once the thieves pry the door, pry the window and try to steal, the alarm can make a loud alarm sound 105 dB to scare thieves and remind the owner. Magnetic sensor switch detects entry protecting your home or office whether you are in or out. Warning door / window sticker is supplied free in package Specifications Main frame size 2.44" x 1.18" x 0.79".Magnetic box size 2.17" x 0.43" x 0.43".Power supply 3 x 1.5V LR44 button cells (included).Button Chime, off, alarm. Sensor type Alarm, Alarm type Sound. Material Plastic-Color White.