The light arms are made of high-quality metal alloy with high flexibility and hardness, allowing them to be positioned and adjusted to any desired angle or shape, providing full-range, multi-angle lighting options. Multiple Power Supply Options: These book lights support AAA batteries or USB power supply. When connected to a DC power source, the device automatically switches to external power and disables battery usage without requiring battery removal. When disconnected from external power, the device automatically reverts to battery power—simply press the button to activate. Batteries are not included. Brightness and Control: The LED lights deliver brightness equivalent to three standard LEDs. Each arm has an independent switch, enabling multiple lighting configurations: one arm on, both arms on, both lights on a single arm, or all lights on both arms. The light is flicker-free, shadow-free, and optimized for reading. Adjustable Clip Design: The clip features an adjustable mechanism with a rotating component at the clip’s tail, enabling secure attachment to objects of varying thicknesses. Versatile Use: Suitable for music stands, reading, piano playing, orchestral performances, desks, computers, knitting, sewing, and crafting. Compact and portable for travel or nighttime reading in bed. Color: Black Material: ABS + Metal Package Includes: 2 x Musical Score Lamps Note: Color may vary slightly due to screen settings. Measurement tolerance: ±1–3 cm.