Power options for uninterrupted reading The book light supports multiple power sources: USB cable or three AAA batteries (not included). In USB/power mode, you can connect to a DC power supply and the external power will drive the light while the internal battery is automatically disconnected. When unplugged, the light runs on battery power again; to turn on, use the power button. Adjustable Clips The clip can grip objects of different thicknesses. A small independent turning piece at the clip tail expands the clamping range, helping the clip secure firmly to items. Flexible metal alloy arms The light arms are made from quality metal alloy, offering both flexibility and strength. They can be positioned in any orientation and locked into the desired angle and shape for a full range of lighting. Bright and adjustable lighting The LED lights attached to the clipon light are as bright as three standard LEDs. The dualarm design supports multiple configurations: one arm on, both arms on, two lights on a single arm, or all lights on both arms. The light is designed to be flicker with no shadows or glare, suitable for reading. Use scenarios Inbed nighttime reading without disturbing others. Desk or workstation use for focused illumination during study or work. Travel, dorm rooms, or spaces with limited power, using battery mode for portability. Notes Requires three AAA batteries (not included). The package does not include batteries. The light can operate via USB power or battery power as described.