Shure MX391/S Microflex Supercardioid Boundary Microphone (Black)MX391 S Supercardioid, Black Equipped with features like programmable, silent membrane switches, logic inputs and outputs, and LED indicators, Microflex Boundary Microphones are the high quality solution for a range of applications such as altars, boardrooms and distance learning centers. Every Microflex Boundary microphone features a choice of interchangeable condenser cartridges. MX391: Includes attached 4 meter (12 ft) cable terminated with a 4 pin