Product name: Door and window anti-theft device, chassis alarm. Product features: Easy installation, stable and affordable. Small size Main component specification: length 6.2cm, width 3cm, height 2cm Attachment specifications: 5.4cm in length, 1.3cm in width, and 1.1cm in height Product Introduction: Utilizing electromagnetic induction technology, it is easy to install and inexpensive. In the open state, as long as the doors and windows are opened, the machine will emit a 90db alarm sound. Keeping you away from anti-theft doors and windows brings inconvenience to you. Enjoy the sunshine and freedom to the fullest. Product Usage: Installed in doors and windows, cabinets, computers, drawers, and other places that are not allowed to be opened by others in homes, companies, and warehouses, when thieves pry open doors and windows or computer chassis; Or if someone outside the hotel on a business trip opens the door, it will sound an alarm. Please check immediately to ensure that your property and safety are damaged. Product Usage: Simply peel off the adhesive tape on the back of the security alarm anti-theft device and stick it on both sides of the door or window (leaving a gap of about 0-2cm). When you use it, simply turn the switch to the "ON" position and it will be in standby mode. If someone moves or opens the door, computer case, or window drawer, it will immediately sound an alarm to deter thieves and remind you to check, It does not stop until you turn the switch to the "OFF" position or close the doors, windows, computer chassis, or drawers. EASY INSTALLATION:no wiring needed, plus sensor mounts on either side of alarm for easier set up and batteries included. MAGNETIC SENSOR: Magnetic sensor switch detects entry protecting your home or office SUPER LOUD ALARM: When someone opens the door or window illegally (the relative position of the primary and secondary parts changes), the alarm can issue a strong alarm, warning the intruder to leave and remind the owner . SUITABILITY AND STABILITY:Super environmental suitability and stability and dustproof and insect prevention.