The Ring Alarm Contact Sensor 2nd Gen is a set of two wireless anti-theft devices designed to enhance your home security. They are easy to install and use, offering a reliable solution for keeping intruders at bay. The sensors are compatible with the Ring Alarm Security Kit and can be placed on doors, windows, or any other entry point to detect unauthorized access. With a model number of 842861111088, the sensors are perfect for home improvement projects and are a must-have for anyone who values the safety of their home and loved ones.