MICROPHONE ~~ UHF HIGH BAND WIRELESS MICROPHONE SYSTEM FEATURE . High sensitivity cardio id capsule for your professional use. . Special noise absorption parts inside the barrels, which eliminate switch shock noise and handling noise. . Frequency with quartz locked contra. . Easy-opening battery compartment for quick battery replacement. Power by one 9V battery. . Low battery LED indicator. . The Cavalier microphones is easy for use clip on the belt & very light. It can be used with headset mic wi3.