Unidirectional Microphone: Built-In Professional Moving-Coil Unidirectional microphone core, when uses, the mouth should be close to the top of the microphone to loud voice for Conference, Speech, Outdoor, Church, Family Party, Open Ceremony, Dancing Instructor, Promotion, Etc.●If You Use Multiple Mic At The Same Time or Noise, Please Switch Channels(Open the mic battery cover, click the“HI LO”button), Make sure each mic channel number is different and the channel numbers are far apart.
Google