The advanced yet simple-to-use Technic™ Small Hub combines and controls Technic motors, sensors, and other elements to create fun, interactive models. With 2 input/output ports, Bluetooth connectivity, 6-axis gyro, and a rechargeable battery with micro USB charging and connection port, the Small Hub is at the heart of any SPIKE™ Essential model. • Features 2 I/O ports, Bluetooth connectivity, 6-axis gyro, and a rechargeable lithium-ion battery with micro USB charging and connection port. • For use with Technic™ motors and sensors. • Take control of your Small Hub with the free SPIKE™ App for tablets and computers.