Product Information: The Shure 515SBG-18X microphone is a low-impedance, dynamic microphone designed to be mounted on flexible goose-necks or fixed pipes. Optimized frequency response and a unidirectional (cardioid) pickup pattern makes them ideal for language labs, paging applications, and base station communications. They are also recommended for use as talk-back or cuing microphones in TV, film, and recording studios. Product Features: Frequency response optimized for announcing, narration, and paging applications Cardioid pickup pattern symmetrical about axis Neodymium magnet for high signal-to-noise ratio Shock-mounted cartridge for quiet operation and low stand/handling noise Tough diecast locking grille and handle Built-in push-to-talk button controls microphone circuit and relay or control circuit 45.7 cm (18 in.) gooseneck and mounting flange supplied