This is an entire M80 Dynamic (capsule, head grill, output transformer), neatly packed in a wireless capslue body with thread on terminal connections.
The M80-WH, M80-WHB and M81-WH are designed to mate with Shure ULX2, SLX2, UR2 and PG2 wireless transmitters. In addition, the M80-WH, M80-WHB and M81-WH are also interchangeable with the Lectrosonic and Sony brand wireless transmitters.
The M80-WH, M80-WHB and M81-WH do NOT mate with the Shure PGX2.