Ring Alarm Contact Sensor (2nd Generation) $15 + Free Shipping

Ring Alarm Contact Sensor (2nd Generation) $14.99. Shipping is free. Get instant mobile alerts when doors and windows open in your home. Now smaller to enable increased placement options. Easy installation with no tools required. Mounts to door and window frames. Includes 2 x 3V CR2032 batteries. Requires the Ring Alarm Base Station.