Quality Manufacturing: The Sony ECM-W3 comprises two microphone-transmitters featuring high signal-to-noise (S/N) ratio microphone units, and a dual-channel receiver Noise Suppression: A noise cut filter using digital signal processing to effectively remove noise, and a low cut filter that reduces noise in the low-frequency range, are provided on the microphone side Quality Digital Transmission: Connecting the receiver to a camera from Sony that supports the Multi Interface (MI) Shoe allows the digital audio signal output from the receiver to be recorded directly by the camera, enabling high-quality recording