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(1) Use LED as the light source.
LED is an excellent light source, it is well-know that it has gentle ray, super bright (pure white color) , and without frequency change, benefit from preventing eyesight.
Long life, low power consumption and high convert rate from power to light are also LEDs features.
(2) Without high voltage circuit, the DC 4.5~6. V power from USB or adapter is safe for use.
(3) No battery is required.
(4) Ideal for notebook or desktop computer use.