Elgato Eve Weather (1st Generation) - Wireless Outdoor Sensor with Apple HomeKit technology, Bluetooth Low Energy Know your home: Eve Weather senses temperature, humidity and air pressure Improve your comfort: your personal weather data at your actual home Gain insights: your personal data by day, month or year HomeKit-enabled: unparalleled ease of use and advanced security Works with Siri: ask for temperature and humidity Truly wireless: powered by long-lasting, replaceable batteries Easy setup: direct connection using Bluetooth Smart technology, no hub or gateway required