This 115-Volt unit cools rooms up to 550 sq. ft. with a cooling capacity of 11,800 BTU. The LT1216CER Through-the-Wall Air Conditioner quickly and efficiently cools medium to large rooms. The unit is designed with easy-to-read digital controls and a digital display for simplicity of use. Plus, this unit features a convenient 24-hour on/off timer. The interior unit shuts off when the timer setting is reached. The Auto restart function automatically restarts this unit to the programmed setting when the electricity comes on after a power failure. Wall sleeves are sold separately.