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eufy Security Entry Sensor, Detects Opened and Closed Doors or Windows, Door Monitoring, Sends Alerts, Triggers Siren, 2-Year Battery Life, Indoor Use Only, Requires HomeBase, 24/7 Monitoring Optional white healthJAPAN_March2024 FREE Dielectric Grease - Preventseufy Security Entry Sensor, Detects Opened and Closed Doors or Windows, Door Monitoring, Sends Alerts, Triggers Siren, 2 Year Battery Life, Indoor Use Only, Requires HomeBase, 24 7 Monitoring Optional Product Features 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. 100 decibel Siren: Enable or disable siren