Works in areas up to 7m/s. Purifies the air eliminating smells, bacteria, dust, and smog. It has a sterilization function: The combination of positive and negative ions released by the plasma generator produces high voltage to kill bacteria and viruses in the air. You may have the light on or off. You may control this unit with your phone using wifi. It has a timer control for 1, 2, 4, and 8 hours. The fan can move from left to right at 90 degrees. Use it in your bedroom, office, living room, and dining room.