Secondary zoning control (Z955W required and sold separately);Wireless sensor on single zone system (T955WH required);Three mounting options- desktop, removable wall mount and permanent wall mount;Configurable for ambient sensor only, system setpoint override control (T955WH), and full zone control (Z955W);Connect up to four indoor remotes to a T955WH or Z955W;Blue back-light;Glow in the dark light button;Easy access battery compartment;Electric or Gas configurable;Separate heating and cooling swing (cycle rate) adjustments