3 IN 1 HYDRAULIC ROBOT ARM

It's a robotic arm that no need batery and motor, just need water to 
drive your robotic arm. By converting the hydraulic pressure into
power, the joystick can easily control the various joints movements 
of the robotic arm. There is the interesting fact that modern 
machinery uses hydraulic power to assist in various tasks. The robotic 
arm consists of 220 components, which can exercise children's 
logical skills and hands-on skills, and explore scientific principles. 
The robotic arm has three functional modes: 4-jaw grab bucket, 
tongs grab, suction cup. Fly your imagination to enjoy the joy of the 
hydraulic robotic arme. Let's do it, little scientist!