Portable 5 Watts USB LED Tube Light is driven by any devices with an output of 5v USB port, such as a computer, desktop, laptop, tablet, tab, car cigar lighter. etc. This product is Environment friendly, with no radiation, no flicker, no harm to human eyes. Power saving tube light, no heat, low power consumption, stable performance. High efficient light source low voltage of 5v constant voltage drive, the use of it is very safe and reliable, easy to use, no mercury, and other harmful substances, environmental protection. Long-life up to 30,000 hours or easier to install where ever you wish.