The K102 & K101 Series thermostats have a larger, more sensitive, mechanical bi-metal sensor that improves temperature accuracy to ± 3° F. This feature achieves a better comfort level with a reduced temperature swing as compared to economy models. Modem appearance with large knob for easy adjustments. No ground wire required, making installation fast and easy. Now That’s Smart! Clean, Beveled Style Suits Any Decor Sits Flush Against Wall Includes °C and °F Control Dials Bi-Metal Mechanical Sensing Element Operates 41° - 90° F ( 3°- 32°C) Mounts Directly to a 2x4 Inch Vertical Electrical Outlet Box Large Knob Allows Easy Adjustment to All Temperatures Single or Double Pole (Positive Off) Available No Ground Wire Design Imported to King Specifications 1-Year Limited Warranty