Remote sensor for SimpleComfort Standard and Frost Sentryâ„¢ Series thermostats (plus SC4010 & SC5010 PRO models) deal for tamper-prone areas or poor air-flow areas Mounts to standard 2" x 4" outlet box Foam gasket prevents drafts through wall opening For use with ICM's SC1000 series (model dependent) and the SC4010 and SC5010 dual powered thermostats