- With double light source, 15 UV LED 24W bulbs, ideal for treatment of rebuilding nails of hands and feet. Innovative design, you can use all nails at the same time and evenly under the hand or foot in a few seconds. Very light. Automatic timer from 1 to 99 seconds with digital display automatically activates by hand or foot. With USB cable. 1. User-friendly intelligent positioning of the lights at the same time UV LED allows under the nail of the thumb together with the nails of the other fingers, saves time and prevents the gel from draining.