Yu the Great (yu) is selling flutes (一) in front of the elevator (e1). He has a whole box (囗) of them, and he's advertising them by using a microphone (曰).
one / single / a (article) / as soon as / entire; whole; all; throughout / "one" radical in Chinese characters (Kangxi radical 1) / also pr. [yao1] for greater clarity when spelling out numbers digit by digit