The light arms are made of quality metal alloy material with high flexibility and hardness, allowing them to be positioned and adjusted to the required angle and shape, providing a full range of multi-angle lighting options. Multiple Power Supply Modes: These book lights offer multiple power supply options, including AAA batteries or USB cable. When connected to USB power, the device automatically switches to external power and cuts off battery power without requiring battery removal. When disconnected from USB, the device automatically reverts to battery power. Simply press the button to operate. Batteries (three AAA) are not included. Meet Your Multiple Needs: The LED lights on these battery-operated clip-on lights provide brightness equivalent to three standard LED lights. Independent switches on each arm allow for various lighting combinations: one light on a single arm, both lights on a single arm, or all lights on both arms. The lights are flicker-free and shadow-free, designed to meet a variety of lighting needs. Adjustable Clips: These rechargeable night lights feature adjustable clips that can securely grip objects of varying thickness. A small rotating component on the clip tail enhances clamping range and ensures a firm hold on different surfaces. Wide Range of Uses: These rechargeable book lights are suitable for use on music stands, books, pianos, in orchestras, music performances, workbenches, computers, and are also ideal for knitting, sewing, and crafting. They are practical, versatile, and portable for travel or use at night in bed. Color: Black Material: ABS + Metal Package Contents: 2 x Music Stand Lamps Note: The package includes only the items listed above. Other accessories are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement error allowance is +/- 1-3 cm.