Audio Technica ATW-T220A Handheld Microphone User Selectable Frequencies - The ATW-T220AD Handheld Microphone Transmitter features PRO41 capsule for maximum feedback rejection and consistent sound. Tone Lock tone squelch system fights interference. 2000 Series handheld microphone / transmitter with cardioid dynamic element, 656.125-678.500 MHz (TV 45-48)