The Nano SPY door contact sensor detects the extended opening of a door with fast response time (1.7 milliseconds) and accuracy. This prevents early temperature alarms when a fridge or freezer door is left open unwanted. The data logger connects to a Nano SPY LINK or Nano SPY RELAY/ALARM module installed nearby. Measurements are then automatically sent to JRI MySirius (cloud) application. Alerts are sent in real time. The Nano SPY Door contact features 3 alarm LEDs (green, blue, red) and internal magnet for mounting in the supplied mounting bracket or metal background. The logger has a memory of 10,000 measurement points.