This micro servo is even smaller than typical 9 gram micro servos. It can rotate approximately 90° in each direction. You can use any servo code, hardware or library to control these servos. Good for beginners who want to avoid building a motor controller with feedback & gear box. Of course, it's not nearly as strong as a standard servo, but it works great with the Motor Shield for Arduino or by just wiring up with the Servo library. This micro servo is shipped with a few horns and hardware.