Shure MX392BE/C MicroFlex Condenser Boundary Microphone (Cardioid/Bottom Exit)Surface mount mic; LED logic input switch logic output terminals, screw terminal connections, attached unterminated cable; Bottom Exit option. MX392 and MX393 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