kilofly Super Bright Duet LED Double Lights , Black This great light clips onto any book, music stand, or just about anything else! Two lighting heads each contains two large LED lights with four different light level options Fully adjustable arms allow the lights to be positioned in almost any angle. Slim design for easy storing and carrying. Powered by USB cable, AC adapter (110-220 volts) or 3 AAA batteries (not included) Size: 30 x 4.5 cm / 12 x 1.8 inch