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. 100-DECIBEL SIREN: If a forced entry is detected, a siren as loud as a jackhammer will be triggered on HomeBase, and you’ll 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. WHAT'S INCLUDED: Entry Sensor, Magnetic Base, Mounting Screws, Instruction Manual, Happy Card.