Data Logger,Wireless Interface Range (F) -4 Degrees to 158 Degrees F, Relative Humidity Range 0 Percent to 95 Percent, Dew Point Range -4 Degrees to 158 Degrees F, Voltage Range 3 V, Accuracy +/-0.7 Degrees F, Time Intervals 1 min to 12 hr, Software Required Free App, Interface Wireless, Calibration Certificate NIST with Data, Includes (2) AAA Batteries.