REGULAR SIZE BRAINWAVE DECK
Spectator holds the deck of cards.  
Magician explains that he has placed one card from another deck, reversed in this deck.  A second spectator names a card.  
 
The magician spreads the cards in full view of all.  Only one card is seen to be reversed.  It is the chosen card.  
 
Turn it over and it has a different color back!
 
Easy to do with this special deck.
 
JUMBO SIZE BRAINWAVE DECK
Spectator thinks of any card and tells the magician.
Magician removes a deck of cards, lets say blue back, spreads the deck face down and the only card face up in the deck is the spectators' card!
 
Not only is it face up, but it is red back!
 
BICYCLE Poker back.
Easy to do!  But wait, it's a Jumbo sized brainwave Deck!  Big enough for large groups to see. 
 
IMPROVED BRAINWAVE DECK (REGULAR SIZE) by DEVIN KNIGHT
The "IMPROVED" version of the Brainwave deck allows the magician to show both the faces and backs of the cards; yet, the freely named card has a different color back!