COMMAND Center Sensors collect store, and transfer data to laptop or hand held Windows computers. Each Sensor is preprogrammed with data collection intervals specified by user at time of purchase. The sensors arrive ready to install and begin retrieving data right out of the box with no activation required. Data is logged for up to two years in protected memory at specified intervals. Sensors are available in 4ft, 8ft and 15ft lengths. Sensor accuracy is ±1°C (1.8°F).