With the logging system you can record measured values from up to 50 temperature & air-humidity sensors. The sensors are connected wireless with the base receiver at the USB (Universal Serial Bus) port of your PC & can be distributed almost everywhere in the house. The radio range is max. 100 m in open space. The base station stores the received data in the internal memory even with the PC switched off. The voltage supply is done via USB (Universal Serial Bus) or independently via an optional mains unit (batteries & mains unit not included in delivery).