It is a remote controller, &allows a Jedi convertacom to operate. The Astro Saber, & Saber convertacoms have built in controllers, which are self contained & complete. However, on the 1322 it holds some parts that the cradle can't. There is also a 1323, & 1324, & others which include RF amps in the various bands. They can easily be spotted because they have 2 power connectors. GARY N4KVE