This multifunctional USB rechargeable clip-on book light provides comprehensive eye-care illumination for daily reading, study and indoor night use scenarios. Built with integrated rechargeable battery, it supports direct USB fast charging without extra adapter requirements, compatible with power banks, computers, USB sockets and car charging ports for convenient anytime power supply. Equipped with 3 adjustable color temperature modes and stepless dimmable brightness control, users can freely switch light tones and adjust light intensity to adapt to different reading environments and eye comfort needs. Flexible multi-angle rotatable body and lamp head achieves wide-range light adjustment, with sturdy portable clip structure that firmly clamps on book pages, desk edges and notebook surfaces without slipping. Ultra-light compact body design ensures portable carry for travel, commuting and outdoor study use, with low-power LED bead components that deliver soft non-glaring light to reduce eye fatigue during long-time reading. Washable durable shell material resists daily scratch and abrasion damage, with simple one-key button operation suitable for all age groups including students and office workers. No extra wiring burden brings convenient independent lighting for bedside reading, late-night study and travel book use, serving as practical daily study accessory with long battery endurance and versatile adjustable lighting performance.