Purpose: it can be installed on doors and windows with a switch. When the switch is opened, if the doors and windows are opened, a loud alarm will sound. Turn on alarm switch when you sleep at night or when you are not at home or in the office to prevent theft.
  
Usage: The alarm consists of a large piece and a small piece. The size of the alarm is attached to both sides of the gap between the two windows respectively. The large pieces are arranged in parallel with the small pieces, try not to exceed 5mm in the middle of the large and small pieces (you can stick it according to the packaging). The small pieces have an arrow, which should be pasted in parallel with the large pieces in the opposite direction. If you want to prevent theft, close the window and open alarm switch. If a thief pushes the window, as long as the window is opened (that is, the large and small parts of the alarm are separated by more than 5mm), the alarm will send a strong alarm sound, the owner of the House will act immediately, and the thieves will catch or flee on the spot.