Plastic, with switchable radio clock, wireless transmission of outdoor temperature via transmitter, indoor temperature display, max-min function, radio clock with date and weekday, time zone ±12 hrs, temperature measurement range outside -40...+60°C (-40...+140°F), maximum range 100 m, transmission frequency 868 MHz, temperature measurement range inside -10...+60°C (+14...+140°F), batteries 2x1.5 V AAA (base station), 2x1.5 V AA (transmitter) not included