Key Features . 2 Year Battery LifeFor Doors and; Windows100 Decibel SirenEasy InstallationSends Alerts to your Smart Devices . Note Requires a Homebase or Homebase 2 to functionEntry Sensor Protect 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 100-decibel siren will go off on the HomeBase (can be disabled). 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 in the Box . Entry SensorMagnetic BaseMounting ScrewsInstruction Manual and; Happy Card. .