This Sigtronics SPA-400 Intercom TSO has been recently removed for upgrade and is compatible with Avionics. It is a great addition to any aircraft intercom system. The brand Sigtronics is known for their high-quality aviation products and this intercom is no exception. It comes with no warranty, but it is still a reliable and durable product. The manufacturer part number is SPA-400. This intercom is perfect for those in need of a reliable and up-to-date communication system in their aircraft.