Remote control or reprogram! Add to any Cubelets kit to extend your robot. The Bluetooth Cubelet contains a tiny Bluetooth radio that you can pair with your phone, tablet or PC. It also provides a gateway to stay up-to-date with Cubelets technology. The Bluetooth Cubelet is compatible with iOS and Android devices! This Cubelet is pre-loaded with the newest Cubelets operating system, Cubelets OS 4. Cubelets are lead free. For ages 4 and up.