The light arms are made of high-quality metal alloy, offering flexibility and durability. They can be positioned and adjusted to any angle or shape for optimal lighting. Multiple Power Supply Options: This book light can be powered by AAA batteries or via USB cable. When connected to a power source, it automatically switches to external power and disables battery usage without requiring battery removal. When disconnected from power, it automatically reverts to battery power. Batteries (3 x AAA) are not included. Brightness and Controls: Features bright, flicker-free LED lighting suitable for reading. Independent switches on each arm allow multiple lighting modes: one arm on, both arms on, or all LEDs on simultaneously. No glare or shadows. Adjustable Clip Design: The clip is adjustable to fit various thicknesses. A rotating mechanism at the clip’s base enhances grip strength and stability. Versatile Use: Ideal for music stands, reading, piano practice, orchestral performances, desks, computers, knitting, sewing, crafts, travel, and bedtime reading. Color: Black Material: ABS + Metal Package Includes: 2 x musical score lamps Note: Actual product color may vary slightly due to screen settings and lighting conditions. Measurements are approximate.