1Usage: Home security door alarm can emit a strong alarm sound to scare the thief and remind the owner and the people around to catch the thief. 290dB Volume: Door window sensor adopted 90db alarm to detect entry, keep your home, office, garage, shop, dorm or apartment safety. 3Easily Open: Wireless door alarm sensor adopted separation install design, allow you can easily open the door and window, suitable for daily use. 4Easy Installation: You just need to apply the double sided tape on the back of the door magnetic alarm sensor, and attach it to the door or window. 5Easy Control: Door window alarm using wireless magnetic control and long distance wired control, with microcomputer technology to prevent interference.