The Sound Devices WM-Connect USB dongle is a Bluetooth connection module for all 6 series recorder mixers (663, 664, 688). Their firmware must be upgraded to version 4.0 or higher if necessary.
Bluetooth connection then allows you to use the Wingman app available for free only on the Apple App Store. Once again Sound Devices seems to forget that Android is the first operating system used in the world of smartphones.
The Sound Devices Wingman application lets you start and stop recording, display Vumeters and Timecode, edit file metadata, name, arm or disarm tracks, and create the sound report which can then be sent by email.
The USB-A male dongle comes with two USB-B to USB-A female adapters, one on short cable, the other compact at right angles.