The Security System is a gray monitor with a camera-looking laser that only zaps someone if it detects a threat. Strangely, in a code-red situation, the security system becomes alive.
Role in episode
Squidward is angered that SpongeBob and Patrick are ruining his Sunday. Upon rummaging through the Sunday paper, he sees an ad for this security system and gets it installed in his house. SpongeBob and Patrick are able to walk right in to Squidward's house, however. The former wants to give him an apology cake, but Squidward wants the security system to get rid of his annoying neighbors. Squidward tries banging on it to get its attention, but he is instead zapped, which makes SpongeBob drop the cake on the system to make it declare a 'Code Red' situation.
Squidward's house comes to life and launches a full-scale attack on Bikini Bottom while SpongeBob and Patrick try to find a way to turn it off. It ultimately gets turned off and crushes Squidward. After he kicks the pair out, the summoner presents Squidward with a summons to do Community Service every Sunday for the rest of his life, which has also been received by SpongeBob and Patrick, who look forward to it, unlike Squidward.
It is unknown how it did not pick up SpongeBob and Patrick when they walked in to Squidward's house, though this is likely a result of the pair's lack of punishment for annoying Squidward and the latter's misfortunes.