Portable comfort control works anywhere in home for new level of comfort and convenience. Works in both zoned and non-zoned applications. Powered by RedLINK™ reliability. No interference with other wireless devices in home. Works with compatible RedLINK™ enabled thermostats and accessories. Installs in minutes. Touchscreen interface with backlit display. Can display outdoor temperature and humidity. Built-in pager with audible noise helps locate device. Screen-lock feature helps prevent accidental changes. One-year battery life. Two-month low battery warning In non-zoned applications. Take it anywhere in home to sense and control temperature. In zoned applications, view and adjust all RedLINK™ enabled thermostats from single control. Controls up to 16 thermostats. Sensor element: thermistor.