White alarm system is easy to install, just copy paste on the door and the door frame, respectively, or on the two Windows, and alignment (leave about 5 mm clearance). When someone is illegal when a door or window is opened (main and auxiliary). White alarm applies to residential areas, offices, shop counters and other anti-theft. White alarm to send a strong warning, warn intruders to leave yourself at the door, window, can be controlled by the switch. White alarm Qty of 120/piece wholesale price negotiable, quantities of 1 piece.