The outdoor temperature is determined by its own radio transmitter, while an internal sensor measures the indoor temperature. With the push of a button, either the indoor or outdoor temperature can be displayed in large format. Monitoring the room temperature is an important factor for a comfortable and healthy living environment and helps save energy. Even a one-degree reduction in temperature can lead to up to 6% lower heating costs. The outdoor temperature provides you with reliable information for your home, garden, leisure, and work. Additionally, the device features a memory for maximum and minimum values, as well as a clock display. Batteries 2 x 1.5 V AAA (base station), 2 x 1.5 V AAA (transmitter) are not included.