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Expand your Ring Alarm system to secure each door and window in your home and get alerts as soon as they open. Ring Alarm Contact Sensors mount to any door or window frame in your home for easy DIY installation. Connect them to your Ring Alarm and receive mobile alerts from the Ring App so you ll always be the first to know when something s ajar.¹ ¹Requires Ring Alarm Security Kit (Gen 2). † Requires Ring Alarm or Ring Alarm Pro Ring Alarm and all Ring Alarm accessories require a subscription for digital notifications in-app features digital arming/disarming and integration with other Ring Echo and third party products. Subscription sold separately. Terms and conditions apply.