Keystone KSTAW15CE is a powerful air conditioner with both cooling and heating capabilities, suitable for rooms up to 700 square feet. It features three fan speeds, a programmable timer, sleep mode, and an energy-saving mode. The unit can be installed in a window or through an exterior wall and comes with an adjustable window kit and a remote control for added convenience. The washable filter ensures easy maintenance, and the one-year warranty provides peace of mind.