The D-Rive (pronounced 'like 'derive', not 'drive') is the primary digivice used by the tamers of Digimon re:CONNECT.
Its primary purpose is to serve as a conduit for digivolution. It absorbs and stores data from defeated digimon and reconfigures it to be usable by the digimon linked to the device. The D-Rive is able to absorb data much more efficiently than a Digimon's natural processes can, especially when the data cloud is thinned by the effects of the real world.
Each device is uniquely linked to both the digimon and the human they correspond to. Even though a D-Rive doesn't have to be actively operated to work (there's no 'hit button to Digivolve' button), it does not work if it's not in close proximity to its human owner.
Functions & Features
The first time an unfamiliar digimon enters its range, it will light up; after the first time, it will still bring up an entry on the radar, but won't independently activate.
When connected to a computer by its USB port, the D-Rive dumps a file that is both cryptic and heavily encrypted. At present, it's unclear what this is for.
Digivolution forced through the use of a D-Rive is generally refered to as an induced digivolution (or evolution). Unlike natural digivolution, which is permanent, induced digivolutions are temporary. As a recipient digimon becomes more adept at handling their power, induced digivolution can be maintained longer and done more easily.
Drive Evolution, which elevates a digimon temporarily from Rookie to Champion using a burst of data, is relatively straightforward. At least initially, it seems to be activated by either the digimon or the human partner being in direct danger.