Build your own custom alarms with logiblocs! This steam science kit includes color coded, plug-and-play electronic building blocks, Each color coded with unique functions that can be combined to create custom circuits. The little blocks can be turned into more than 10 different smart circuits including an intruder alarm, metal detector and coin card. Change the input trigger and logic control to make your own gadgets that perform various functions. Requires three AAA batteries - not included.