Specifications: Material: plastic + electronic components Size: 6.2*3*2cm color: White Package Included:1pc * 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 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.