The Countryman B6 Omnidirectional Microphone (model numberB6W4FF05BSR) is a tiny, tiny lavalier microphone with a 3.5mm locking connector for use with Sennheiser body packs. Includes two protective caps (for “crisp response” and “very crisp response”), a small lapel pin-style holder, and a “buttonhole” mount- plus a carrying case. A very nice professional lav mic for times when concealability is crucial.