What kind of loudspeaker does a loudspeaker put him on the collar of his clothes?
The clip on wheat is usually wired with an amplifierIn addition, lapel wheat is far from the mouth of class effect is not good but wearing glasses headset, people use, or very suitable, for musical instrument line
The teacher uses a wireless microphone or a microphone with a clip holder.
Collar clipIt's just a Mac, not an amplifier, and an amplifier to speak and play
