Pop or flop, reaction game, brain game, pop it game. A lightning-fast reaction and memory game with 4 games, adjustable sound level. 2 x AAA batteries (not included). Dimensions: 8.7 x 7.5 x 4.2 cm. Ideal for on the go. Depending on the game mode, the illuminated buttons must be pressed as quickly as possible. Warning: addictive!