LG LSL121N-1 is a room air conditioner with a variety of features to help you stay cool and comfortable. With its powerful cooling capabilities, you can quickly lower the temperature of your room on even the hottest days. The unit also features a variety of fan speeds, so you can customize the airflow to your liking. Additionally, the LG LSL121N-1 has a sleep mode that automatically adjusts the temperature and fan speed to create a more comfortable sleeping environment.