Dr Tech&reg; WF-1070T Wireless Humidity Temperature Weather Station Series Transmission frequency: 433MHz ; Transmission range up to 100 meters in open space Humidity Range: 10% to 99% ; air pressure, weather forecast, and moon phase display Indoor Temperature Range: 32F to 140F or 0C to 60C ; Outdoor Temperature Range: -40F to 149F or -40C to 65C Max / Min record of indoor and outdoor humidity and temperature ; powered by 3 x AA batteries (not included) Digital display of date and time ; radio controlled clock ; alarm with snooze