Philips USB monitor is capable of displaying images and drawing power directly from your laptop USB ports with a single USB cable. No extra power or video cables are required resulting in a simple, single cable, extra low power connection between your laptop and monitor. White LED's are solid state devices which light up to full, consistent brightness faster saving startup time. LED's are free from mercury content which allows for eco-friendly recycling and disposal process. LED's allow for better dimming control of LCD backlight, resulting in super high contrast ratio. It also gives superior color reproduction thanks to consistent brightness across the screen.