Features:【USB Lamp】: The design of USB port is very convenient and practical, you can connect it to laptop, pc, computer, power bank, adapter(not included), etc. DC 5V with 1,5m cable and has excellent durability. This versatile and comfortable reading lamp is free of flicker and glare, which helps prevent eye strain. Attention: This USB desk lamp cannot be charged!【Adjustable Colour and Brightness】: The 48 LED USB reading lamp with switches and simple function keys, which can let you adjust the light to three color temperatures (cool white / warm white / natural light) and different light intensities (10% 100%) to meet different lighting needs. Various levels of illumination which is ideal for nighttime reading, black color.【Clamp Lamp with .