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