Wooden Rainbow Tower Small Drone The book uses water only

The book uses water only

Positioner Optical flow positioning

this aircraft is ultra-lightweight yet remarkably stable

and non-toxic

Wooden Rainbow Tower Small Drone The book uses water onlyThis rainbow tower can train your kids sizes sorting, color recognition and eye hand coordination. Can help to develop manual dexterity, visual perception, hand eye co ordination, problem solving and ability to grade size. High quality wooden material, round smooth surface, it won't scratch hands Odorless, environmental protection, very safe and healthy to use Eight wood blocks with different colors, can be stack up according to size order or reverse