Ambient Weather WH2C Wireless Thermo-Hygrometer
Wireless outdoor humidity range: 1% to 99% RH (+/-5% accuracy) with calibration
Wireless outdoor temperature range: -40.0°F to + 149°F (+/- 2°F accuracy)
Indoor temperature range: +32°F to + 140°F (+/- 2°F accuracy)
Transmission range: up to 300 feet open air (ideal conditions), 100 feet for most applications
Transmission frequency: 433MHz