lavalier microphone. The ECM-44B has an omni-directional polar pattern , intended for body-mounted voice pick-up. It is passively powered by AA battery. Output via mono balanced XLR connection. Sony ECM-44B Lavaliere Microphone Lavalier Microphone Kit The F&DM Equipment Checkout Lab releases the Sony ECM-44B Lavalier Microphone in a microphone kit package.