Arexx wtr rd1 tightrope walking robot arexx engineering wtr rd1 p the arexx wtr rd1 is an excellent robot for beginners with the help of this battery operated kit you can learn the basics of robot mechanics and movements the robot is easy to assemble and is suitable for children over 8 years old you only need a few simple hand tools to put it together and a screwdriver is included in the kit p p putting together the individual components assembling the robot and understanding the inst