This game is like Charades on 'Speed'. The active player gets four cards. Each card has two words on it, one easy, one difficult. The harder the word, the more points it's worth. The player picks one word from each card and loads them into the timer device. S/he then has about a minute to communicate the words to teammates; when a word is guessed correctly, the card must be snatched out of the timer. The timer, meanwhile, will "eat" the cards, one at a time, if they aren't snatched. You get points for each card successfully rescued from the timer.
Reimplemented with different rules: Electronic Guesstures