Features: Both 2-pipe and 4-pipe system are available. Programmable mode for more versatile demand. 4 fan speed adjustable (low, mid, high and auto). Sleek and simple appearance fits your modern house perfectly. 3.7 large LCD screen with backlight, which displays data clearly. Using flame resistance material, the thermostat is safe and reliable to use. With this high-efficiency and energy-saving thermostat, not only can it drives down home energy costs, but also provides you comfortable living environment.