This is a switchcraft TA4M 4 pin mini xlr male socket to 3.5mm(1/8') thread locking plug. The input socket is silver plated of very high quality & suitable for SHURE lavalier lapel headset microphones that use the ta4f mini male xlr plug. It is compatible with Sennheiser bodypack transmitters.

Basically this adaptor allows you to use any SHURE headset/lapel microphones on any Sennheiser bodypack transmitter.

Converts SHURE Headset & Lavalier Microphones To Sennheiser Bodypack Wireless Transmitters.