"Phoenix MT221 Brand New Includes One Year Warranty, The Phoenix MT-221 is the daisy chain kit that is used to connect two or more Duet Executives into daisy chain allowing larger room coverage. MT-221 Features: 11' Daisy Chain Kit, Includes Connecting Cable & Dummy Plug, Compatible w/ the Following Models: Duet Executive (MT202-EXE)"
"Duet Executives Desktop SpeakerphoneThe MT221 Daisy Chain Kit is used to connect any two or more Duet Executives into a daisy chain, thus allowing for larger room coverage. The kit includes the neccesary cable for connecting any two Duet Executives along with a single ""dummy"" plug. One kit is necessary for every additional Duet Executive added to the chain.Hardware Connectivity KitMT221Phoenix AudioPhoenix Audio Technologieshttp://www.phnxaudio.com"