Sennheiser ME2 3.5mm Lapel Mic (Bundle)

The Sennheiser ME2 is a lapel microphone with a 3.5mm TRS connector with a locking ring.  NOTE:  The locking ring may prevent the connector from fully seating in devices that don't have a microphone port with a locking-ring thread.  This mic requires plug-in power to operate.

(More details here.)