WATER POWER is an eco-friendly group of hydro power generation building blocks, which uses a pressurized water recovery system and is applicable for green energy power experiments for school as well as in family play. The hydropower system combines air and water pressure to transfer into mechanical power. To play a creative design of water power system, vehicles and even helicopters enable children to complete the work by hand and to do outdoor or indoor race. You could also play water-jet without the WATER POWER motor by releasing the pressured water on the ground to make the car move.