This extremely well put-together and mighty spunky little droid is stopping by to perform a spot of maintenance on your workstation.
R2's third leg (goodness me) functions as a micro-vacuum cleaner. When he gets full you can unscrew his little domed head to empty out the dust.
The desk vac perfectly pays homage to the fact that R2 was basically a swiss-army Droid with a myriad of functions - fire extinguisher, electric prod, buzz saw, pliers, smoke screen etc. etc. We've seen exclusive behind the scenes footage of 'The Force Awakens' and he can be clearly seen hoovering the floor.