Shure MX392BEO Microflex Boundary Microphone with Bottom ExitThe MX392BE Microflex Wired Boundary Microphones from Shure are equipped with features like programmable, silent membrane switches, logic inputs and outputs, and green LED indicators. The high quality solution for a range of applications such as altars, boardrooms and distance learning centers, Microflex Boundary microphones feature interchangeable condenser cartridges. The MX392BE features a Surface mount mic; LED logic input switch logic output