Honeywell THP2400A1027W White Coverplate Assembly Go to amazon.com Related posts Check expert advices for honeywell thermostats plate? FeatureWhite Cover plate!For use with the Prestige 2-Wire IAQ Thermostat!Easy installation!Use to cover marks on the wall or to mount the thermostat to a 2 in. X 4 in. electrical box DescriptionFor use with the Prestige 2-Wire IAQ Thermostat.