Navigational instruments, namely, on-board computers for unmanned multicopters, unmanned helicopters, unmanned aerial vehicles, and drones; radio transmitters, receivers, and controllers for controlling unmanned multicopters, unmanned helicopters, unmanned aerial vehicles, and drones; radio receivers and transmitters for radio-controlled toy models; telecommunication machines and apparatus, namely, head-mounted display, wearable video display unit, radio communication machines and apparatus, ...