Learn the science and mechanics of how barrier gates work! Once you've built it, you can use it to keep pesky intruders out of your room. It also includes a “smart key” that needs to be inserted for the gate to open. It’s a cool mechanical science gadget.

• Recommended Age: 5 Years
  
  
• Includes Smart Key for opening gate
  
  
• Also required but not included in this kit: a small crosshead screwdriver and 2x 1.5V AAA Batteries
  
  
• Barrier Length: 25 inches when built