eufy Security, Entry Sensor, Detects Opened and Closed Doors or Windows, Sends Alerts, Triggers Siren, 2-Year Battery…
Amazon.com Price: $29.99 (as of 06/02/2022 16:41 PST- Details)
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2-year Battery Life: One battery provides 800 days of monitoring.
For Doors And Windows: Compact and versatile design fits onto any door or window frame. Requires eufy Security HomeBase.
