The U30-NRC is a weatherproof data logger with inputs for up to 10 Onset smart sensors. It communicates with your computer via a USB communication cable. This data logger has a storage capacity of 512 Kb and can log at user-specified intervals of 1 second to 18 hours. Depending on the sensor types connected and the sampling interval, the logger can be run with its rechargeable battery for several months. Beyond this duration, external power is required. It has a normal operating range of -20 to 40 °C (-4 to 104 °F) and can withstand an extended temperature range of -40 to 60 °C (-40 to 140 °F) although operation at these more extreme temperatures will decrease battery life.