The BRESSER Temeo Hygro Quadro allows you to measure the temperature and air humidity in or around the house; with simple observation in one place: Is your basement too wet and at risk of mold? Is everything okay in the children's room? Is it too hot on the terrace? You can read the data of 4 different areas at the same time, so at a glance! The three sensors transmit the data to the main station on the 433 Mhz radio frequency. The main station works with 3 AAA batteries) and 6x AAA batteries are needed for the 3 sensors. (The batteries are not part of the package) CHARACTERISTICS: measurement results from 4 different locations also suitable for monitoring wet rooms early prevention of mold 433 Mhz transmission frequency the sensors are splash-proof - suitable for outdoor use with Thermo / hygro remote sensor (3x) wall bracket and built-in support digital display inside or external temperature measurement (° C/° F selectable) DCF time signal (RC hours CET) weather forecast (24 hours) transmission frequency: 433 MHz range: 30 m