Adjustable Speed And Sound Control. Multi-Voltage Options 110-120V OR 208-277V. Adjustable Heat Settings. Externally Visible Service LED. 80% Less Energy Than Conventional Hand Dryers. Adjustable Speed and Sound Control. Adjustable Heat Control - High, Medium, Low and Off. 95% Cost Savings Vs. Paper Towels. HEPA Filtration System proven to remove 99.97% of potentially present bacteria at 0.3 microns from the air.