When the sun shines on the solar panel at the back of the cockroach, it makes electricity. It then shakes its body as if its ready to prey on something. It's novel and unique, also it's a good demonstration of solar power on a small and cute scale, Both specially esigned and eco-friendly , this product is also an excellent teaching tool to let your students to know some basic knowlage about solar energe A fun demonstration of solar power.a wonderful enlightenment for students' solar energy concept teaching as well. They're funny to have especially when you have a number of them all shaking at the same time, might give you the chill NOTE: As the ITEMS is very small , The children who ues it should above 3 years old Great gift for children or friends Size : 42x20x13mm(approx) color: blackNote:1.The project won't really move around.It will mimic the actions of the cockroach predation and vibration2.This solar cockroach can only vibrate in the sun,It can't charge,please understand,thank youincludes:1 X Solar Power Toy 6 Legs Black Cockroach Children Toy Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.