The mask will run the UV and cleaning cycles for six hours on three lithium-ion rechargeable batteries, and the battery pack conveniently sits on your belt. If you can access a power source, a USB converter cable is included, so you can power up for as long as you want. An airplane traveler can use the USB port attached to an airplane seat, for UV-germicidal purified air with comfortably positive air pressure. You can sit there for hours, breathing easily.