This is an almost complete Lego Mindstorms EV3 Kit, no. 45544. Note that there is another EV3 kit (31313) with some different parts.  There are a few parts missing, namely: The rechargeable battery (I always used AA batteries and they give a nice long runtime), one part 6271827, one part 6276951, and one 6288218.  These parts will cost very little to buy off one or other of the Lego aftermarket websites.  All electronic/mechanical parts are functioning as they should. The box is in good condition, with the only blemish being that the white of the lid a little discoloured around the moulding points.  This does not affect function at all.