Smartglasses; Wearable computers; 3D spectacles; Virtual reality headsets; Head-mounted displays; Data processing apparatus; Tablet computers; Mobile phones; Application software; Downloadable software applications (apps); Computer programs, downloadable; Headsets for playing video games; Smartwatches; Television apparatus; Video projectors; Video display apparatus; Chips (integrated circuits); Electrical adapters; Computer network routers; Electronic door locks; Batteries, electric