1PC Black Cockroaches Built-in Micro-Motors,Solar Powered,Simulation,Lifelike,WK specially designed&eco-friendly Solar Power Energy Cockroach Child toy No battery or other power source needed, just put them under the sun to obsorb energy from the sunshine to make them vibrating and move Both specially designed 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. Solar energy provide with motive power, Built-in mini motor engine Simulation design.