Servo Motor 
This is a positional motor; inside the blue motor housing there is a small control computer. It requires a signal to be sent to it from the SnapCPU to request the position it should move to.
The servo motor (blue) can be moved away from the circuit base board by using a standard audio phono lead to extend the connection.
The triangular servo base includes an LED to confirm that it is connected to the circuit correctly, and built-in protection for the motor / controller if it has been incorrectly installed.
Blockly includes commands to set-up and position the servo.
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Power is connected to +v and -v, whilst data is transferred via the middle connection.