The Logiblocs e-Building Blocks System Alarm Tech Kit by 4M allows you to discover and invent electronic alarms out of light and touch sensors which can trigger all sorts of surprises. This kit contains 7 plug together blocks including power base, button, light sensor, circuit not, red LED, bleeper and a detailed instruction booklet. The kit includes more than 30 projects and applications such as Intruder Alarm, Rain Detector, Treasure Guard, Water Bleeper, Morse Code Machine, and many more. You can test your logical skills. Batteries: x2 AAA batteries required Suggested Age: 8+