The GRI 4532 Miniature Overhead Door Contact is a reliable and efficient component for home surveillance systems. With a compact design and a maximum gap of 2.5 inches, this product is perfect for monitoring overhead doors with ease. The closed loop mechanism ensures accurate detection and the brand's reputation guarantees quality performance. Ideal for those looking to enhance their home security without the need for a complex setup, this miniature door contact is a valuable addition to any surveillance system.