? Large digital display with one-touch backlighting ? Setpoint retained in memory in the event of a power outage ? Easy-to-install front-wired design ? Field configurable for added compatibility Specifications: ? Electrical rating: 18 to 30VAC ? Temperature range: 40?F to 90?F (heating); 45?F to 99?F (cooling) ? Differential: 1?F ? Dimensions: 3-11/16" diameter x 1-7/16" D