Can anyone help me remember the name of this game? We played it around 2005. It was an electronic game with a purple (I think) unit. There were no teams. Each player chose a color. All the participating colors checked in on the unit to start the game. There was no game board. The game then chose a color to take a turn. You would select a card and insert it into the unit. The game then decided if you had to describe it, draw it, or act it out. The game also chose which color you would be doing the card with. It was all completely random. The game unit kept up with the score and at the end announced how many points each color had earned. I think there were two electronic hosts, one male and one female. I distinctly remember the female voice slowly saying, "Maybe you should try to act", slowly sounding out each letter in the word 'act'.
Could this be Cranium Turbo Edition?
It has an electronic purple unit and 4 different types of activities: Data head (fun facts), Star performer (act & hum), Creative cat (sketch & sculpt), and Word worm (word puzzles).
Your description reminded me of Taboo. Therefore, I googled for an electronic version of the game and got two hits.
I do not know these versions so I do not know if they match the rest of your description but I hope one of these two is the game you are looking for.
It could be Pictionary. Although this does have a board, maybe you have a different version. But in pictionary, you do have 2 different coloured cards and you have to draw what card comes up. The "unit" that you are talking about might be an electronic version of Pictionary where the "unit" gives out a random card.