DLKPro Downloadkey:

The DLKPro Downloadkey is the ideal transport medium for small fleets, workshops and authorities to read mass storage data from the digital tachograph as well as data from the driver card. Because the DLKPro Downloadkey has in addition to the normal functions:

• An integrated battery for power-independent data download from the driver card and for activating the integrated display. All other functions are available without a charged battery
• A reminder function for upcoming downloads to ensure compliance with legal regulations