Microphone Adapter, for seamless integration with Sennheiser Lavalier microphones and sony UTX-series transmitters. including UTX-B40 and UTX-B03 models. Equipped with a mini jack 3.5mm locking screw mechanism, it provides perfect compatibility with a range of Sennheiser models such as ME2, ME4, MKE2, and MKE 2-ew-GOLD and more.. The adapter ensures a clean static free audio transmission. the receivers shown in the pictures above "Sennheiser Sk100 & sony UTX-B03" are NOT part of your purchase only the adapter is for sale!!.