The Keystone 12,000 BTU 230V through-the-wall air conditioner with "Follow Me" remote control is perfect for cooling a room up to 550 square feet. It has electronic controls with LED display and a temperature sensing LCD remote control allowing you to conveniently see, set and maintain the room temperature from across the room. Money saving features include energy saver mode, sleep mode and a programmable 24-hour timer. Plus quiet operation (56.5 dB on low) helps you get a good night's sleep. This unit is designed for through-the-wall installation and is not designed for standard window installation (WALL SLEEVE SOLD SEPARATELY). This unit also requires a special 230V electrical outlet and will not operate with a standard 115V household electrical outlet.