Check the listing for details. David Clark Captian's Priority Cable Assembly PN 40892G-05 Model C98-15CP. Condition: New other (see details). Listed at 15.00 USD. This Marine Radio interface cable by David Clark is New Old Stock (NOS) and still in the sealed package. It is for the David Clark 9800 series Marine intercom and Radio system Comes with the Installation Sheet List price is $50.00 The C98-15CP Captain's Priority is an optional feature which allows the Captain to isolate himself.Radio 1 and Radio 2 from the Co-Captain and the passengers. When this switch is ON, the Captain will have exclusive access to Radio 1 and Radio 2 FREE SHIPPING See my other items for sale www.ebay.com/sch/navstar7/m.html?item=151359371253&ssPageName=STRK%3AMESELX%3AIT&rt=nc&_trksid=p2047675.l2562 See my Headsets that I have for sale at my eBay Store http://stores.ebay.com/KC-Headsets