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Ring Alarm Contact Sensors Pack:1-Pack Form Processing Browser RequiredThe Ring Alarm Contact Sensors detects the opening and closing of doors and windows, so you can keep tabs on who's coming and going in your home even when you're not home. They can be easily mounted to any door or window frame in your home and it sends you mobile alerts whenever your doors or windows open, so youll always be the first to know when somethings ajar. Features Secure your door and windows The Ring Alarm Contact Sensors detects the opening