VVDI MB Tool power adapter  user manual…  Here you go.

First, you need correctly  connect the power adapter with VVDI Mercedes 

Then, you can use VVDI mb tool to fast program new keys to Mercedes when all key lost

It is the vvdi mb tool power adapter that speeds up Mercedes key programming:

• 18 minutes for data acquisition for W204, W207 all key lost
•  no need replug IR adapter for many times during W216, W164 2009- all key lost data acquisition
• directly OBD communication with W164, W164 2009-, W209, W211 without a real gateway

Credits to http://blog.xhorsetool.com/2017/05/02/vvdi-mb-tool-power-adapter-do-all-key-lost-fast/