This small unit can sterilize a small room or area using the same technology used in hospitals. It floods the area with ultraviolet light and ozone, killing most airborne virii and leaving the area sterile. It is rechargeable and can be used two times between charges. To use, press the power button on the bottom, which starts a sterilization cycle. You then have a moment to place the unit on a surface and leave the area before the fifteen minute cleaning cycle begins. It is importand to close off the area and not stare directly at the unit while working.