The Heil RC 37 is the wireless capsule version of the popular Heil PR 37 wired microphone. The RC 37 features the same dynamic element, internal mount, and excellent rear noise rejection of the PR 37. The RC 37 is a superior upgrade to your existing wireless system and will instantly add greater clarity, presence, and quality to your live sound. Cupping the RC 37 does not affect the clarity or quality of the sound as it does with an industry-standard mic, making it the perfect wireless capsule for vocalists in all genres to brilliantly cut through the mix. The RC 37 is compatible with Shure, Sony, Lectrosonics, and Line 6 wireless systems that have removable capsules, and is compatible with some Sennheiser systems with the proper adapter.