“the contact sensor should put inside or outside the house? how long need to change the batterly?”
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Hi happy. Thanks for asking! Ring Alarm Contact Sensors easily mount inside any door or window frame in your home for easy, DIY installation. You'll want to ensure the mounting surface is clean and dry before peeling the backing off the adhesive strip. Ring Alarm Contact Sensors utilize two CR2032 coin-cell batteries (included). We invite you to reach out to our Community if any additional information is needed regarding your question. The Ring Community is our first peer-to-peer community forum, giving our customers the ability to help one another by sharing their feedback and experiences with each other. All the best, Nicole from Ring.
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