Features:1. Ultra-thin design, the back of the product adopts a high-viscosity back sticker, which can be installed on any door or window.2. High-precision materials, never false alarms. When the distance between the host and the magnetic strip exceeds 10mm, an alarm will be issued immediately.3. Low voltage reminder to remind you to replace the battery in time to protect the safety of you and your family at all times.4. When someone come in and open a door or window, making the gap more than 0.5 inches, this product will immediately send out an alarm.5. Remind you immediately when someone come in. Prevent theft when no one at home, and the loud alarm will scare the thief so that you can sleep well at night without worrying about the intrudersNotice:*Actual color may be slightly different from the image due to different monitor and light effect*Please allow 1-3cm deviation due to manual measurementDescription:Size: 75*39*12.2mm and 32*11.5*10mmBattery: 3 x button batteries (include)