[ Blank USB flash drives; Acoustic couplers; Portable media players; Electric door bells; selfie sticks, namely, hand-held monopods for cameras; ] Microphones; Headphones; [ Battery chargers; Batteries, electric; Couplers, namely, acoustic couplers, optical couplers; smartwatches; cases for smartphones; Loudspeakers; Cabinets for loudspeakers; ] protective films adapted for smartphones