Telephone receiver; transmitters of electronic signals; electronic navigational instruments; radiotelephony sets; network communication equipment, namely, network routers, modems and network servers; computer peripherals; sensors, namely, barometric pressure sensors, combo sensors comprising accelerometers and pressure sensors or microphones and pressure sensors, optical sensors and sensor chips for use in detecting or measuring a physical property or physical signals and converting into electronic signals.; telephone transmitter; answering machines; phototubes, namely, photoelectric cells; fluorescent screens; computer monitors; electronic scorers, namely, electronic scoreboards; measuring rulers; signal lanterns in the nature of emergency warning lights; transparency projection apparatus; optical lanterns; integrated circuits; computer keyboards; computer mouse; spectacles; 3D spectacles; stereoscopes; stereoscopic apparatus, namely, stereoscopes; remote control apparatus, namely, remote controls for digital-era hardware, namely, wearable and hearable hardware for virtual reality (VR), augmented reality (AR), robotics and artificial intelligence; light-emitting diodes; backlight modules for LED screen