The Lynxmotion AL5D 4 Degrees of Freedom Robotic Arm Combo Kit is a Serial Port-Based Version of Robotic Arm Combo Kit. The AL5D robotic arm delivers fast, accurate, and repeatable movement. The robot features base rotation, single plane shoulder, elbow, wrist motion, a functional gripper, and optional wrist rotate. The AL5D robotic arm is an affordable system with a time tested rock solid design that will last and last. Everything needed to assemble and operate the robot is included in the kit.