Ambient Weather WS-23-X2-AC Big Digit 8-Channel Wireless Thermo-Hygrometer with Two Remote Sensors with AC Adapter Simple to read, simple to use, and affordable, the WS-23 includes an indoor thermo-hygrometer in the console and can remotely read and update up to eight remote thermo-hygrometer sensors at the same from the large digit, uncluttered jumbo display. The WS-23-X2 includes two remote thermo-hygrometers and six additional sensors can be added (F007TH) for comprehensive monitoring. The uncluttered display console displays temperature and humidity with jumbo 1" LCD characters which can be easily read from across the room. The scroll mode allows you to view the indoor thermo-hygrometer and remote channels without pressing any buttons. In scroll mode, all of the indoor and detected outdoor sensors will be displayed in five second intervals. Includes a bright, back lit display that can be displayed continuously with included AC adapter, or 30 minutes on battery power.