Discover the power of connected energy! When both ends of the Cosmic Energy Rod are touched by one person, it completes the circuit and magically lights up and makes noise. Experiment with energy in a group of friends or family: hold hands in a circle and watch the out-of-this-world science happen! This 7.75″ STEM toy promotes teamwork and connection. Batteries included, not replaceable.From Toy Network, for ages 3 yrs.