Check the listing for details. Ring Alarm Wireless Contact Sensor 2nd Gen for Door & Window (2-Pack) Senser NEW. Color: White, Condition: New. Listed at 34.99 USD. Brand New Factory Sealed Never Opened Ring Alarm Contact Sensor 2-pack (2nd Gen) Get instant mobile alerts when doors and windows open in your home with a Ring Protect subscription (sold separately). Now smaller to enable increased placement options. Easy installation with no tools required. Mounts to door and window frames. Includes two 3V CR2032 batteries. Requires the Ring Alarm Base Station. We want you to know This device requires Ring Alarm or Ring Alarm Pro. This product ships and is configured to operate within the continental United States only (including Alaska and Hawaii). Ring Alarm and all Ring Alarm accessories require a subscription for in-app features and digital notifications, including but not limited to: digital arming / disarming and integration with other Ring, Echo, Alexa, and third party products. Subscription sold separately. View Ring Protect Plans for pricing and details. Customer reviews may reference features that require a subscription. Free Shipping Only Applies To The Continental United States