7-Day or 5+1+1 Day Programmable or Non-Programmable Thermostat 24 Volt or Millivolt system White-Rodgers has set a new industry benchmark with the 90 Series Blue Touchscreen. ?Blue? advanced technology not only delivers all the best features it?s designed to be easy-to-view easy-to-understand and easy-to-operate. Simple and logical installer menu set-up programming and operation are enhanced by audio prompting that confirms touchscreen entries. Features like variable touchscreen securit y to prevent tampering temporary and vacation overrides and filter change reminders add convenience. Our +/- 1? temperature accuracy will keep your customer s comfortable and protect their HVAC systems. 90 Series Blue is the result of smart innovative thinking. Install 90 Series Blue with confidence because it?s exclusively for the professional trade. At White-Rodgers Blue is more than a color.