★Photosensitive Firefly Robot： This electronic kit imitates the shape of a firefly. After turning on the switch, the LED light on the tail flashes like a firefly glowing. When the light enters the two antennae, the firefly will move. It's very interesting ★The best choice for soldering novice and Electronics DIY'er： This DIY kit is very simple. Follow our instructions for soldering, and you will have a 99.9% chance of success. It is very suitable for children and electronic beginners to practice soldering ★Exercise Hands-on Ability: This was super fun and challenging kit for you and your kids, students, electronics lovers to practice their hands-on ability and soldering skills. The connection that was clearly mapped and labeled on the board makes it easy to assemble ★Perfect choice of Kid's gift: This is DIY kits, not the end product! The soldering Project requires basic electronic knowledge and hands-on ability. You will get a funny Electronic simulation firefly when you complete the assembly. The funniest toy gift for kids ★LED light flashing frequency is adjustable：The flashing frequency of the blue LED light at the tail of the firefly can be adjusted by a potentiometer. Note: This product does not contain batteries, you need to prepare button batteries by yourself