Outside temperature via wireless transmitter, range max. 100 m (free field), expandable up to 3 transmitters, also for temperature control of distant rooms such as children's rooms, wine cellars etc., inside temperature and humidity, maximum and minimum values, weather forecast with symbols and air pressure tendency, Radio clock with alarm and date display, background lighting, easy installation, as no cable is required, batteries not included, you need 2xAA 1.5 V and 2xAAA 1.5 V, outside temperature -40 ° C to + 65 ° C, inside temperature -10 ° C up to + 80 ° C, 20-99% humidity