USB input device with luminous function

An input device, comprising:

• a universal serial bus interface;
• a white light-emitting diode unit;
• a red light-emitting diode unit;
• a green light-emitting diode unit;
• a blue light-emitting diode unit;
• and
• a driving part electrically connected between the universal serial bus interface, the white light-emitting diode unit, the red light-emitting diode unit, the green light-emitting diode unit and the blue light-emitting diode unit, wherein the driving part receives electricity through the universal serial bus and provides a first driving current to the white light-emitting diode unit, and the driving part receives electricity through the universal serial bus and provides a second driving current to the red light-emitting diode unit and/or provides a third driving current to the green light-emitting diode unit and/or provides a fourth driving current to the blue light-emitting diode unit,
• wherein the white light-emitting diode unit emits a white light beam in response to the first driving current, the red light-emitting diode unit emits a red light beam in response to the second driving current, the green light-emitting diode unit emits a green light beam in response to the third driving current, and the blue light-emitting diode unit emits a blue light beam in response to the fourth driving current, wherein at least one of the red light beam, the green light beam and the blue light beam is mixed with the white light beam, so that a mixed light with a white balance color temperature is outputted from the input device,
• wherein a first driving current upper limit of the first driving current is X1 mA, an operating current of the universal serial bus interface is X mA, and a relationship between the first driving current upper limit and the operating current of the universal serial bus interface is expressed as:
• 0.8X≤X1≤X.