What safety precautions should I follow when using the foot controller and power supply?

Do not turn on the machine while pressing down the foot controller, as the machine may start unexpectedly and cause injury. Always plug the machine directly into the electrical outlet — do not use extension cords or multi-plug adapters. Turn off the main power and unplug the machine when you are away from it, after use, during electrical storms, or if the machine does not operate correctly. (Page 1)