Displays indoor and outdoor temperature and humidity. Temperature and humidity memory. Temperature trend indicator. Temperature alert. Displays in Fahrenheit and Celsius. Comfort index. Barometric pressure and weather forecast options. Ice alerts. Clock with alarm. Calendar. Moon phases. 200ft Sensor range. Base unit features blue backlight. Indoor range: 32-122F (0-50C). Outdoor range: -4-140F (-20C-60C). Uses 2 AA batteries for sensor and 2 AA batteries for base (batteries NOT included).