Product Name Door and window alarm Weight 3.8g colour White Material ABS+electronic components Installation method: 1. Use double-sided adhesive tape to fix the main machine to the side of the door/window. 2. Glue another bar magnet to the door frame in a straight line along the prompt line of the host machine. 3. Set the host switch to the "ON" position when checking the Settings. 4. Open the door and see if the alarm goes off.