Programmable Thermostat For Home,Conventional Single-Stage Systems,5-1-1 Day Product Details High Compatibility: Forced air (gas, oil or electric), Electric furnace, Hot water steam or gravity radiant heat, Heat only systems, Heat pump w/o auxiliary or emergency heat, Millivolt, Gas fireplaces (24V), Floor or wall furnaces, Cool only systems.(TIP: Before purchasing, check to see if this thermostat is compatible with your system.) Not Compatible: Heat pump with auxiliary or emergency heat, Dual fuel/hybrid heating, Electric baseboard heat (110-240 volts), Line voltage, Convectors, Radiant-ceiling heat, Mini split systems and 12V RV systems. Easy to Install and Use: Large terminal blocks with universal sub-base, can be installed within 30 minutes, clear, easy-to-read backlight LCD display and easy controls make for a user-friendly experience. Factory Pre-set Energy-efficiency Program:5/1/1 easy-to-understand programming menus, flexible programming lets you sync your comfort with your schedule. Simple but Powerful Control: Easy-access front-load battery compartment, adjustable temperature differential (swing) for energy optimization and maximum system life, Support temperature display calibration, Convert C/F units, compressor delay protection (selectable on or off). Dual Power Supply: Can be powered by 24VAC power or 2 AAA batteries, No common wire (C-wire) required on most systems (only required on heat only and cool only systems). Reliability: Made by professional manufacturer and backed by over 20 years of experience, the customer service is 7*24 hrs available. Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.