The Heil RC 22 is the wireless version of the Heil PR 22 and PR 22 UT wired microphones. It features the same characteristics as the PR 22 UT, including the same capsule, the same internal mount, and excellent rear noise rejection. The RC 22 is an excellent upgrade for your existing wireless system and will instantly improve the clarity, articulation, and quality of your sound. It is compatible with most screw-on capsule wireless systems from Shure, Sony, Lectrosonics, and Line 6, as well as select Sennheiser systems with the appropriate adapter (see ambient.de for a list of adapters and compatible systems).