85183000Microphones and stands therefor; loudspeakers, if mounted in their enclosures; headphones and earphones, whether combined with a microphone, and sets consisting of the microphone and a number of loudspeakers; audiofrequency electrical amplifiers; electric sound amplifier set headphones and earphones, whether coupled with a microphone, and sets consisting of a microphone https://landengpuya.free-blogz.com/77932446/about-technology-and-gadgets-trivia