These electronic building blocks are touch-controlled light. According to the principle of the circuit diagram, assembled into circuits correctly, can experience the sound, light, electric effect. It also can assemble into different shape. Also its rebuilding and assembling functions will stimulate kids' creativity at the same time. No doubt that it is called the best entertainment for kids' learning. Blocks give out colorful lights when you touch them. They are made of environmentally friendly materials, safe, durable and non-toxic. It is an ideal combination of fun and education that children could be busy for several hours. They are different from other traditional building blocks but could be compatible with large granular building blocks. Building Blocks could enhance children's interest in learning, cultivate their inspiration of the invention, hands-on experience, imagination, brain and improve their practical ability. Parents can also participate in the assembly blocks. Convenient – Compact and portable, you can storage and carry more convenient. Enjoy and play anywhere anytime with anyone. Children can learn physics knowledge while playing. Best gift for children! Attention: It requires 3 pcs batteries is not included. What's in the box 147 x Block pcs 1 x Instructions