The Sony ECM-77BC9X is a miniature omnidirectional lavalier microphone designed for professional broadcast, sound reinforcement and recording applications. The condenser element features a miniature profile, allowing it to be easily concealed in performance and broadcast situations. The omnidirectional pattern provides even frequency and sensitivity response at the direct and off-axis sections of the microphone capsule. The ECM-77 provides a wide frequency response of 40Hz - 20kHz. The wide frequency response enables the microphone to accurately reproduce audio signals from a wide variety of sources. The ECM-77 is manufactured with a variety of connectors to accommodate various input devices. This version features a 4-pin Hirose connection for use with compatible beltpack transmitters. Phantom power is supplied via the connected body-pack transmitters."