Sennheiser SL BOUNDARY 114-S DW-4 B Wireless Boundary MicrophonePart of the SpeechLine Digital Wireless line of microphone conferencing systems, the Sennheiser SL Boundary 114 S DW 4 B is a wireless boundary microphone optimized for speech transmission in conference rooms, huddle rooms, and meeting spaces. Designed to be placed on a flat surface such as a desk or a conference table, its flat shape is visually unobtrusive for the seated meeting participants. The microphone is equipped with a cardioid polar pattern