Features: 1. Brand new and high quality. Super environmental adaptability and stability. Easily install on windows or doors through adhesives. Suitable for families, apartments, mobile homes, offices, hotel rooms, garages, etc. 2. Super loud 90-decibel alarm sound. When someone opens doors and windows illegally (the relative position of the primary and secondary components changes), the alarm can emit a strong alarm sound to warn the intruder to leave and remind the owner. 3. Magnetic sensor switch. To scare off intruders, when the siren is triggered, the siren will sound until the door is closed. 4. When an intruder breaks in, the alarm will emit a clear and loud sound. Suitable for window or door warning. ​5. Tip: The insulating sheet of the battery box must be pulled out before use. Specifications: Material: plastic + electronic components Size: 6.2*3*2cm color: White Package Included:1pPC/5PCS * window alarm Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement Includes 1PC/5PCS window/door alarms Loud 90 decibel alarm sounds when door or window opens, helps deter intruder and alert residence Easy and convenient to install, requires no wiring, mounting hardware and instructions Included, designed for indoor use only Built in low battery test button to easily check battery life, Includes 3 LR44 of 1. 5V LR44 button cell for each alarm Perfect for home, garage, apartment, dorm room, mobile home, RV, office and more