The VEX Robotics Crystal Upgrade Kit A (Part No. 276-2171) is a robot toy from the VEX brand. This upgrade kit includes necessary parts and components to enhance the performance and functionality of the robot. Designed for regular size robots, this kit is a great addition for anyone looking to customize and improve their remote-controlled toy. With the VEX Robotics Crystal Upgrade Kit A, users can enhance their robot's capabilities and enjoy a more interactive and engaging play experience.