The ME 2 Microphone Lavalier Mic is a replacement for Sennheiser wireless audio bodypack transmitters. It is compatible with various models such as EW 100 G4, EW 500 G2, SK 500 G4, and more. The microphone is designed for hands-free operation and is ideal for broadcasters, TV presenters, musicians, and fitness instructors. It features an external lapel omnidirectional condenser mike with a 3.5mm lock screw and a 10ft cable. No battery is needed for operation.