Sf Wireless IO Thermometer This mini weather station provides humidity levels (humidity range 20% to 95%), and temperature readings (temperature range -40 F to 158F/-40C to 70C) for both inside and outside climates thanks to a remote sensor that radio transmits data to the main station. An internal 12 or 24 hour clock can be set with 2 separate alarms and snooze features. The high/low temperature and humidity memory bank tracks conditions and features an auto scroll function. Programmable temperature alerts inform you once a specified temperature is reached. You can also gauge temperature trends with arrows that show the general temperature trend: increasing, decreasing, or stable. The unit comes with one remote that transmits up to 100-feet. Monitor temperatures in up to 4 different locations with additional remotes. A jack offers an optional 10-foot long temperature probe for use in pools, freezers, coolers, and soil. Both the remote and base unit have low battery indicators to let you know when batteries need to be changed.