2 Heat/ 1 Cool Non-Programmable Thermostat For Home Heat, White Backlit Screen Product Details Before buying, please confirm whether the product is compatible with your system, and check the size of the product to see if it can cover the traces left on the wall of the old thermostat. Aowel AW721 non programmable heat pump thermostat for house up to 2 heating and 1 cooling multi-stage systems. Compatible with Heat Pump systems (with aux or emergency heat) and Heat Pump (without auxiliary/backup heat) systems, up to 2 Heat/ 1 Cool. ?the Menu Initialize Heat Pump System? Compatible with most 24V conventional single-stage systems (i.e. conventional force air, central gas, oil, electric furnaces single-stage system, up to 2 Heat/ 1 Cool ). ?Note: You need to enter the menu and set it to conventional system? ?WARNING?1. Does not work with conventional multistage systems, mini split systems and 12v rv thermostats. ( 2. Not compatible with 110-240V electric heat systems (like electric baseboard heat, line voltage, convectors, radiant-ceiling heat). Dual 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). Easy-to see and read, 5.0 sq inch display with white backlight, large clear backlit digital display, very suitable for middle-aged and elderly people, With display indoor temperature and humidity Digital thermostat with Separate heating and cooling swing (Cycle Rate), default 0.5F (0.2F to 2F) and 3 minute compressor delay protection (Selectable ON or OFF) or Low Battery ireplacement reminder. Support error correction of ambient temperature display. Accurate temperature control of +/-1-degree F for consistent comfort. Room temperature display range (32F to 99F), Temperature control range (44F to 90F). Friendly Service: 2-year worry-free warranty and 24h customer service. (Tip: before purchasing please check whether the wiring port of the old thermostat matches) 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.