The warm yellow light, protect your eyes, proper soft light, will not diturb you when sleeping. This bestie gift nightlight is a flat that made with 3d technology to show the optical amazing 3d illusion. It is a good decor for table, office, bedroom ect. Energy efficient: 3.3W power, 5V voltage, universal USB interface cable,powered by usb cable. Your bestie will be overjoyed when she receives it. This is a gift for a bestie, a good friend. The light is powered by usb cable(included), no batteries needed.