A walkie-talkie is a two-way radio transceiver used for communicating from far distances. It first appears in the episode "Boating School."
It is a blue transceiver that has an antenna and a red button on the side. It has a speaker and a light blue clam on it. In several episodes, the clam is lavender. In "Safe Deposit Krabs," the walkie-talkie is gray rather than blue.
Patrick uses walkie-talkies to help SpongeBob cheat on Mrs. Puff's driving test. He puts one in SpongeBob's head and hides the antenna with a cowboy hat. At the end of the episode, SpongeBob reveals the antenna to Mrs. Puff and admits that he cheated.
Patrick takes it out so that the group can call Sandy. However, when they call, Sandy thinks Squidward stole the walkie-talkie. Patrick then thinks Sandy is trapped in the walkie-talkie (which he calls a box) and destroys it.