Sennheiser SL HANDHELD SET DW-4-US R SpeechLine Digital Wireless SL Handheld Set DW-4-US RM Wireless Mic with Rackmount KitThe SpeechLine Digital Wireless SL Handheld Set DW 4 US RM from Sennheiser is a wireless microphone system with rackmount kit that includes a handheld transmitter, a stationary receiver, and a MME 865 condenser capsule. It can be used to capture speech in presentations or lectures for meetings, conferences, and more. Featuring bi directional communication between transmitter and receiver, the SL Handheld Set requires no settings to be adjusted. The