Eve - Door & Window - Wireless Contact Sensor Know the status of your door or window. See the open & closed state at glance, create automations to control other connected devices throughout your home, and receive activity notifications. Eve Door & Window features future-proof technology with Matter, cutting-edge Thread networking, and no tracking whatsoeverfor a universal and rock-solid smart home that honors your privacy. Technical Specifications:  * Requirements:iOS/iPadOS 16.4 (or later) / Android&trade 8.1 (or later) Matter controller / Thread Border Router (find compatible devices on evehome.com/hub) * Power: 1x ½ AA (ER14250 3.6V) Replaceable Battery * Wireless Connection: Thread * Dimensions: 52 x 24 x 23 mm 18 x 18 x 8 - 23 mmRecommendation for Placement:  * Accessories for: Apple Home / Samsung SmartThings / Amazon Alexa / Google Home * Smart Home Products * App-Enabled Technology * Connected Home & Smart LivingIn the Box:  * Eve Door & Window  * 1 x ½ AA