The servo motor shield we'll use in this example is available at most online retailers who sell Arduino Uno, and is made by AdaFruit. The following figure shows the servo motor shield connected to the servo wires:

This particular shield can handle up to 16 servos. The important characteristic of this servo shield is the connection on the right-hand side of the shield. In the GND and VCC connections, you'll place your external voltage and current input, allowing Arduino to control many more servos.