The E-mily nano mister is petite, sweet and portable. It is not heavy and is USB chargeable. No Batteries! The nano mister produces an ultra fine mist that will provide the perfect balance of moisture. We recommend to use for no more than 3 seconds per eye. The nano mister has many uses. You can use it at the end of every service to soothe the eyes and during service to flash cure adhesive. Also, it is very useful for clients with sensitive eyes.