This wireless security alarm features a built-in magnetic sensor that detects when a window or door is opened and immediately sounds a 90-decibel alert. The two-piece system includes a sensor unit and a magnetic trigger that work together to monitor entry points throughout your home or office. Installation is simple and tool-free, using the included double-sided adhesive tape to mount both components on any door or window frame. The alarm is ideal for multiple security applications, from deterring intruders at entry points to preventing children from accessing restricted areas like medicine cabinets or gun safes. Each unit operates on three LR44 button cell batteries that come included, and the sensor activates when the magnetic pieces are separated by more than 5 millimeters. The compact white plastic design blends discreetly with most door and window frames. This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm under Proposition 65. The alarm provides an affordable way to enhance home security and child safety without complex wiring or professional installation.