Sennheiser SL BODYPACK -HS 2 KIT DW-4 - SpeechLine Digital Bodypack Transmitter with HS 2 Headset Kit (1920 - 1930 MHz)The SL Bodypack KITs DW are the perfect complement to the new SL Multi Channel Receiver DW. Each KIT contains the compact and robust SL Bodypack DW bodypack transmitter, which is specially designed to transmit the spoken word and is compatible with all Sennheiser neckband and lavalier microphones (e. g. SL Headmic 1 or MKE 1). Thanks to the bi directional communication between transmitter and receiver, no adjustments need to be made at the transmitter