2-YEAR BATTERY LIFE: One CR-123A battery provides monitoring for 730 days FOR DOORS AND WINDOWS: Small and compact design fits onto any door or window frame POWERFUL SIREN: If a forced entry is detected, a siren as loud as a jackhammer will be triggered on HomeBase, and youll be notified instantly on your smartphone EASY INSTALLATION: Just peel off the mounting tape and stick the sensor onto the door or window you want to monitor Entry SensorProtect Your Doors and Windows from Break-Ins with eufy Security Entry Sensor. Once a window or door is ajar by 1.5 inch, an alert will be sent to your smartphone, and a powerful siren will go off on the HomeBase (can be disabled). Requires eufy Security HomeBase.eufy Security: Less Trouble. More Secure. Ever Expandable.Surveil your home from front to back for total peace of mindCreated by the same team as Anker: renowned for exceptional quality and innovation Features Operating temperature (T-T) -10 - 50 °C Easy to use Yes Product colour White LE