Shure SH-899 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.