The light arms use a durable metal alloy for high flexibility and hardness, allowing you to set them in any position and adjust the angle and shape for full-range, multi-angle lighting. Adjustable Clips: the clip-on lights grip objects of different thicknesses. A small, independently rotatable tail on the clip expands the clamping range and helps keep the clips firmly fastened on items. Meet Your Multiple Needs: the LED lights attached to the battery-operated clip-on lights are as bright as three standard LEDs. The dual-arm switches support multiple configurations: one light on a single arm, both arms on, two lights on the single arm, or all lights on both arms. They are designed to avoid flicker, shadows, and glare, suitable for reading. Multiple Power Supply Modes: these book lights can be powered by three AAA batteries (not included) or USB. In USB/power mode, you can insert a DC plug to take over power supply and the battery power is automatically cut off. When unplugged, battery power resumes with a simple button press. Note: batteries are not included. Use scenarios: ideal for reading in bed or on a couch, clipping to books, notebooks, or headboards; suitable for late-night study or craft work at a desk; can be clipped to shelves or a bedside setup to illuminate targeted areas without disturbing others.