Ideal for Robotics units. The DC motor operates from 6-12V DC and runs with KELVIN® Variable Speed Power Supply (sold separately). Comes with two stands for holders. Choose your own height (low to high) or remove. Add your sensors to count, sort, read IDs, time, etc. Dimensions: 3 ft. long x 4 in. wide with adjustable height. Comes assembled. Robotic arm and power supply are sold separately.