Eyeglasses; Headphones; Scales; Audio amplifiers; Audio headphones; Cabinets for loudspeakers; Game headphones; Global positioning system (GPS) apparatus; GPS navigation device; Humanoid robots with artificial intelligence for use in scientific research; Music headphones; Rechargeable batteries; Smart watches; Smart glasses; Smart rings; Video projectors; Virtual reality headsets; Wearable activity trackers; Wireless headsets for smartphones; Wrist-mounted smartphones