This extra lightweight clip-on lamp is a great companion for crafting or reading. It can easily clip onto a book, needlework frame, table or laptop. The flexible arm directs the light where it is needed. The dimmable daylight LEDs provide high contrast and accurate color matching, making it easier and less tiring to read, work and see detail clearly. 2 ways to power: internal rechargeable battery & USB cable from your computer or phone charger. The rechargeable battery provides up to 4 hours of light.