Use your own USB cable to try. The machine must be charged until all lights turned green. Please do NOT turn on the machine when charging.
Once the machine is charged, unplug and press the "ON/OFF" button for 3 seconds, then the light should turn to red. To change modes, press the "ON/OFF" button once each time you want to change the strength setting (1/Low Power, 2/Middle Power, 3/High Power).
Change to strength setting 3, then press and hold the "OUT" button, let the needle touches the metal/apple/banana, you should see the slight lighting when the needle is touching something.