Omnidirectional Microflex Boundary Wired MicrophoneShure Microflex MX300 Series microphones are surface mounted electret condenser microphones designed primarily for mounting on conference tables,stage floors, and lecterns. Their high sensitivity and wide frequency range make them especially suitable for picking up speech and vocals in sound reinforcement and recording applications. Interchangeable cartridges provide the installer with greater flexibility and make it possible to easily reconfigure