Cameras; Computer peripheral devices; Electric connections; Electric door bells; Electric wires; Electrical plugs and sockets; Galvanic cells; Hygrometers; Integrated circuits; Light emitting diodes (LEDs); Photometers; Phototelegraphy apparatus; Scales; Semi-conductors; Semiconductor devices; Smartphones; Sound transmitting apparatus; Transistors; Triodes; Vehicle traffic signals; Voltage stabilizing power supply; Smart watches