Volume 141 Catalog Page: 124, 1261-stage heat/1-stage cool, single-stage heat pumpBattery or hardwire powerFor gas, oil, electric heating/cooling & millivolt systemsBig, clear display - easily read in low lightingKeypad lock, temperature limits, backlight buttonTerminals: RC, RH, C, OB, W, Y, G6"W x 3-3/4"H, horizontal mount1F83C-11NP