The robot is powered by the chemical reaction of salt water, and is safe and non-toxic. Technical Specifications: Material: Plastic Color: Grey Age Range: >8 Years Finished size: 4cm x 5.8cm x 5.8cm/1.6" x 2.3" Features and Benefits: ● A great chance for children to learn about this new energy, see how amazing it is to just add salt water to make the robot ● FC module includes 3 parts, the Magnesium metal sheet is a consumable item, one sheet can make the robot for about 4 hours continously ● Kit includes 3 Magnesium metal sheets ● Children can experience the joyance and achivement with the assembly, which can help to cultivate their innnovation and intelligence ● Recommended for ages 8 years and up ● Powered by salt water, No batteries required ● With just salt water, a child can discover how to power a robot ● All material used in this kit are environmentally safe and clean, no toxic substance or disposal concerns Notice: 1. Please allow 1-3mm error due to manual measurement.Pls make sure you do not mind before you bid. 2. The color may have different as the difference display,pls understand. Package Contents: 1 x Salt Water Powered Robot Kit 1 x User Manual