SainSmart 3-Axis Desktop Robotic Arm, Assembled for Arduino UNO MEGA2560 (Silver) Pre-assembled. It consists of three MG995 servos, which enable the robotic arm move stably and flexibly. Wrist range of motion: 180 degree. Great for learning robotics, electronics, Arduino programming and Python programming. Extra holes are resevered for further expansion. We recommend to use with SainSmart rotating platform. Can be controlled by arduino UNO/MEGA. We provide test code. U-bracket on the arm can be mounted directly on the base in the car or any other desktop platform.