Shure SM-820A Professionl Wireless Microphone

Shure SM-820A Professional mic has a longer Battery life of abut 6 hours non
stop using 9V battery. It produces a Clear original sound quality. Has a
very high sensitivity, wide range of direction & dynamic state,
less distortion rate, light weight & not easy destroyed. It is
widely used with the professional systems in a recording room, on a
professional stage or in some testing instruments. Has a high function
kinetic coil mouth piece. Has a steady all-direction antenna installed
& it can be adjusted to a suitable angle to receive the best signal.
In addition, it has a True diversity receiver filter of the RF, to
avoid those interference signal from band outside. It is also
incorporated with a Multilevel quiet control circuit, to avoid
interference signal from outside open the mute system.