The Kosmos Control Unit ET5 is an educational model kit released in 2007. It is designed to teach children about electronics and electricity through hands-on experimentation. The kit includes a control unit and various components that can be used to build circuits and explore the principles of electricity. The Kosmos brand is known for producing high-quality educational toys and games, making the Control Unit ET5 a great choice for parents and educators looking to inspire a love of science and learning in children.