... 1.Household 2.Theory Temperature Sensor 3.Color of housing :white, silver, gray and other ... 2pipe,4pipe optional back-lit illumination programmable ProgrammingChoice of 7 day, 5/2 day programmable ornon-programmable ... 95mm x22.5mm* Backlight life: 5,000 hours.* Battery type: CR 1220 (Backs up clock only)* Battery life: ... size: 13x13x7cm* Carton size: 68x28x43cm T8100AC series of touch screen thermostat