This audio cable is designed for use with the Sennheiser / SONY wireless receiver to mixer recorder

Audio line input cable for Sound Devices 633 664 688 MixPre mixer

Plug A:Neutrik Mini XLR 3 pin female TA3F plug

Plug B:locking 3.5mm TRS mini plug

For Sennheiser EK500 EK2000 and SONY UWP D11 Series receiver