The Audio-Technica ATW-T1406 is a digital wireless boundary microphone/transmitter compatible with a System 20 PRO receiver (available separately). The unit delivers high-quality sound at 24-bit / 48 kHz resolution and features a low-profile form factor well suited to conferencing and educational applications. The built-in microphone uses an electret-condenser capsule that can handle SPLs up to 139 dB and features a cardioid polar pattern that focuses audio capture in front of the mic for less unwanted background sound. A customizable mute button lets you choose between toggle, touch-to-talk, and touch-to-mute modes, depending on your preferences, while an OLED screen on the bottom shows you channel, level, and battery information.