The ATW-T220 cardioid dynamic wireless handheld transmitter incorporates the PRO 41 dynamic element created for professional live sound venues. The element includes internal shock mounts for low handling noise. An integral two-stage pop filter within the steel headcase protects against “p” pops and other breath plosives. The transmitter includes an adjustable gain control to tailor the input to the sound source. An integrated two-position power/mute switch eliminates the need for a separate mute button. An RF power select switch offers high and low settings. The transmitter operates on two standard AA batteries and a battery condition indicator illuminates when the batteries are good. An internal channel selector allows the transmitter to operate on any one of ten channels. The transmitter is constructed of high-impact materials and includes a heavy-duty