LingsFire Magnetically Triggered Alarms for Doors or Windows Home Security Window/Door Alarm Kit (4-Pack), Loud 100 dB Alarm Magnetically triggered alarm are used to guard the opening of both doors and windows. Peel and stick the alarm to every entrance to make sure your home is protected. With high reliability, frequency stability, low consumption, strong penetrating power and other characteristics. Can help you focus on your child whether to open the windows and doors or cabinet ensure the safety of children. If a burglar opens the protected door or window, a magnetic switch inside the sensor, will trip, which sets off the security system. Super loud alarm of 100dB, scare thief away. Includes 12x LR 44/AG 13 button cell batteries.(3pcs for each alarm device). Peel and stick the alarm to any window/doors. Slide the ON/OFF switch to ON to arm the device. If the protected entryway is opened while the product is armed, a loud 100dB alarm will immediately and continuously sound. The 2 parts need be aligned by their alignment arrow. The Distance between them should be less than 10mm. Dimensions: 2 x 2 x 0.8 inches (Each) Weight: 46g/0.1lb (Each) Batteries: 3 x LR 44/AG 13 button cell batteries each(Included) Color: White