Someone opens the server-room door, the A/C fights a warm afternoon, and you don't find out until the alert hits an hour later. This little sensor closes that gap. It sits on the door — yours or a third-party rack's — and tells your NetBotz system the second it swings open. 50 ft of cable means you can route it cleanly without a daisy-chain of adapters. It's not rack-mountable by design; it's meant to clip onto the door frame where it belongs. Operating range is 0 to 45 °C, humidity up to 95%. If your monitoring stack already runs NetBotz, it drops in and starts reporting. Add to cart and it's on its way