Door and window anti-theft alarm Wireless Home Door Window Entry Burglar Security Alarm Magnetic Sensor 3pcs-white Product information: [Single product size] The overall length is about 6.2cm [Single product weight] 0.038 kg [Product material] ABS+electronic components This product is easy to install, just paste the main unit on the door frame and the auxiliary unit on the door, or on the two windows, and align the arrow of the auxiliary unit with the mark on the side of the main unit. When someone illegally opens the door or window (the main and auxiliary parts are separated by more than 10mm), the alarm can emit a >90db alarm sound to warn the intruder to leave. When the door and window are to be opened by oneself, it can be controlled by a switch. Use 3.5vlr44 button battery (battery is not included in the product). The alarm is installed on the door or the window, if a thief wants to open the door or the window, the alarm will immediately send out an alarm sound, and the switch can be turned off when not in use. The alarm uses magnetic induction control technology, which has a long service life and is easy to install. It is pasted with self-adhesive, no screws are needed for installation, it can be used directly by pasting! No damage to household items! (It can also be installed in the computer case of Internet cafes to prevent computer hardware from being stolen) Uses: It can be installed on doors and windows with a switch. When the switch is turned on, if the doors and windows are opened, a loud alarm will sound. When sleeping at night or when you are not at home or in the office, turn on the alarm switch to prevent theft safely. How to use: The alarm is composed of a large piece and a small piece. Stick the large and small pieces of the alarm on both sides of the middle gap of the two windows respectively. The large piece and the small piece are arranged in parallel. You can paste it according to the packaging), the small piece has an arrow, and it should be pasted parallel to the large piece in the opposite direction to the arrow on the large piece. To prevent theft, close the window and turn on the alarm switch. If a thief pushes the window, As soon as the window is opened (that is to say, the large part of the alarm is separated from the small part by more than 5mm), the alarm will sound a strong alarm, and the owner of the house will act immediately, and the thief will catch it on the spot or leave it alone. escape. pack*3pcs.