This Elmdane Door Sensor is a top-of-the-line product that ensures your home security. With its advanced technology, it can detect any unusual activity around your doors and alert you immediately. The sensor is easy to instal and suitable for use on internal or external doors. The Elmdane 6RSA-100-GN Shutter Contact Sensor is a must-have for anyone who values safety and security. It is a reliable and durable product that provides accurate and consistent performance. This Door Sensor is perfect for use in alarm systems and home security applications. Get yours today and enjoy the peace of mind that comes with knowing your home is always safe and secure.