Each tentacle on your LED Under the Sea Squid Hat lights up along with the eyes. The hat turns on with a simple flip of a switch. The battery pack is tucked away into the hat. NOTE: When you order 1 piece, you are ordering a set of 12 Assorted Color Hats. Therefore, when you order 9 pieces, you will receive 108 Assorted LED Under the Sea Squid Hats. 1 Dozen Assorted LED Under the Sea Squid Hats come in assorted colors of pink, green, and blue. Included are four AG10 batteries. Batteries are replaceable for continued Squid fun!