PRO 1 T755WHO T700 PLATFORM WIRELESS UNIVERSAL THERMOSTAT WITH OCCUPANCY - 7 DAY - 5+1+1 - 0 DAY PROGRAMMABLE - 4H/2C UNIVERSAL WITH 7 SQ. IN. DISPLAY. PART OF THE PROSYNC WIRELESS SYSTEM. COMPATIBLE WITH R751WO WIRELESS INDOOR SENSOR) - AND R250W (WIRELESS OUTDOOR SENSOR) - SENSORS NOT INCLUDED.