Check the listing for details. SR-4 Expansion Module for IISX Aircraft Intercom, by Flightcom. Condition: New. Listed at 69.99 USD. Flightcom, SR-4 Expansion Module for IISX Aircraft Intercom The SR-4 intercom expansion module from Flightcom, is made for the IISX Intercom. It allows the pilot to expand from a 2-place to a 4-place portable intercom system. With a 6-foot cable, the SR-4 module can reach most second row of seats on light aircraft. 623 FREE DOMESTIC SHIPPING with tracking numberFor International Shipping* we use eBay's Global Shipping Program (Courier Service) for safe, fast and secured worldwide shipping.*International Shipping is the cost of shipping the item to your destination country. Please, be advise this cost does not include any import duties or fees your country's Customs might impose on the importation of this item. We, have no control on the import duties or fees or the amount.Thanks for landing @ World Pilot Supplies, an Authorized Dealer