eufy Security by Anker Add-On Entry Sensor

2-Year Battery Life: One 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.

Dimensions (Overall): .87 Inches (H) x 1.1 Inches (W) x 2.9 Inches (D)
Weight: .13 Pounds
Features: Alerts Upon Forced Entry, Wireless, Cell Phone Alert
Assembly Details: No Assembly Required
Mount Type: Adhesive
Includes: Self-Adhesive Strips, Rechargeable Battery, Window or Door Sensor
Operating System Compatibility: Apple iOS, Android
Wireless Technology: Wi-Fi
Compatible With: Eufy Security by Anker Products
Minimum Operating Temperature Fahrenheit: -4
Maximum Operating Temperature Fahrenheit: 122
Motion Detection Angle: 100 Degrees
Power Source: Battery
Battery: 1 Non-Universal Lithium Ion, Required, Included