What's the difference between VS and VS-D?
VS-D is Direct Audio input-compatible.  The SCOLAflex-i FM receiver can be attached via a slide-on connection to the bottom of the hearing aid. Alternatively, a 3-pin DAI adapter is available when using DAI equipment featuring a 3-pin Europlug connection. DAI use (eg. FM) for the VS is only available wirelessly through the FM+DEX accessory.