b. VHF wireless microphone: divided into two types of low-frequency and high-frequency band, the former use VHF50MHz band, due to the lower frequency, the use of antenna length is too long, and the most vulnerable to a variety of electrical interference, so this type of product, in the 21st century, has been replaced by the high-frequency band and gradually disappeared from the market. The latter use VHF200MHz band, due to the higher frequency, the use of antennas shorter, and even can be designed as a hidden antenna, convenient, safe and beautiful, by the interference of electrical appliances and greatly reduce the interference of clutter, the circuit design is extremely mature, the popularity of the parts of the price is low, so it has become a popular model on the market today.
c.UHF wireless microphone: the use of frequency 300-3000M wireless microphone. Is the 21st century microphone application of the mainstream. Because it avoids the interference of the V section of the walkie-talkie and so on, so the stability has been greatly improved.