Oregon Scientific RMR803 Helios Solar Climate Monitor at $34.99,
features a built-in solar panel extends the battery life in the weather station by using energy from the solar cells. The Helios Solar Climate Monitor allows you to monitor the current temperature indoor and outdoor as well as the indoor humidity, all while helping to save the environment outside.
Features:
Displays indoor/outdoor temperature and indoor humidity
Solar panel draws from ambient light to power the unit and extend battery life
Features daily high/low memory for temperature and humidity
Ice Alert function: LED light blinks when outdoor temperature nears icy conditions
Features date and US time zones
Atomic Clock
Wirelessly transmits outdoor sensor data from 100 feet away (unobstructed)
Outside temperature range: -4 degrees Fahrenheit to 140 degrees Fahrenheit (-20 degrees Celsius to 60 degrees Celsius)
Backlight for easy viewing in lowlight conditions
Main unit requires 2 AA batteries (not included)
Remote sensor requires 1 AA battery (not included)