Color temperature options and eye comfort Three color temperatures available: 3000 K, 4500 K, and 5500 K. The soft, glare light helps protect your eyes, making it suitable for reading in bed or reading on ebooks. Brightness and memory Maximum brightness: 50 lumens. Memory function keeps the last used brightness as the default setting. To adjust brightness: press and hold the power switch to raise brightness from the current level to 100%. Release the switch and press it again to set brightness to 15% of full brightness. Power, charging, and runtime Battery: 250 mAh lithium polymer. Charging: via USB port (any USB port). Full charge time: about 40 minutes. Runtime when fully charged: approximately 2–3 hours. Charging indicator: red light stays on during charging and turns off when charging is complete. Clip design and mounting Clip features a magnetic back for secure attachment to metal surfaces. Suitable for fixing to tables, bookshelves, iron bed frames, and other iron products. Also capable of clipping onto books, ereaders, and tablets for quick installation. Use scenarios Bedside reading: attach to a headboard or nearby metal surface, select a comfortable color temperature, and adjust brightness for a glare reading experience in bed. Page or device illumination: clip to a book, ereader, or tablet to illuminate pages or screens without shining into the eyes. Flexible workspace lighting: fix the lamp to a desk edge, bookshelf, or iron frame to provide targeted light for studying, drafting, or latenight work.