The Audio Technica AT831cw is a cardioid condenser clip-on lavalier microphone designed for hands-free professional audio applications. It is manufactured by Audio-Technica and features a compact design that allows for easy attachment to clothing. The microphone is ideal for use in musical performances, public speaking events, and other situations where hands-free operation is required. It is particularly noted for its use in picking upacoustic guitar sounds. The wireless connectivity ensures that the user can move around freely without being tethered to a device.