The Ducati Data Analyzer (DDA) storage dongle is comprised of two separate pieces: the dongle itself, and the USB connector cap. This thing serves several functions. First, it keeps the cap and the dongle together. Second, it protects the connector on the side of the dongle that interfaces with the bike. Finally, it provides a way for the dongle to be attached to a keychain. Print then snap your DDA dongle in the case and attach a keyring. I use an "S-Biner" to make attaching and detaching easy.