The Ring Alarm Contact Sensor (2nd Gen) is a wireless alarm system extension designed by Ring. It features easy installation on doors or windows for enhanced home security. This device is typically used to alert users of unauthorised entry, making it ideal for monitoring access points in residential properties.\n\n--\nOur eBay Store\n\nPlease note: This item has a longer lead time for dispatch then normal as it's a non-stocked item that is ordered in, please see the estimated delivery date by eBay. We will of course ship the item sooner if possible.\n\nRing 4SD1SZ-0EU0 2nd Gen Contact Sensor for Doors/Windows App-Controlled\n\nProduct Details\n\nThe Ring Alarm Contact Sensor (2nd Gen) is a wireless alarm system extension designed by Ring. It features easy installation on doors or windows for enhanced home security. This device is typically used to alert users of unauthorised entry, making it ideal for monitoring access points in residential properties. \n\nNameValueApp compatibilityY;