Product details:

Dimensions 5-13/16 W x 1-1/2D x 3-9/16 H. Precise comfort control (+/- 1F) up to 2 stage heat, 2 stage cool. Changeover auto/manual selectable. Terminal designations rc, r, w (o/b), w2 (aux), y, y2 (e), g, l, c. Voltage 24 volts. EcoSource Exclusive. Min.