The upgraded lightweight rechargeable book light has 3 different color modes and 3 brightness levels. The book light is USB-C rechargeable and provides 8 – 80 hours of powerful, non-diminishing brightness based on your brightness setting. This lightweight reading light weighs ONLY 1.4oz and is small enough to easily carry around. The clamp opens about 1.6 inches and clips on book or kindle perfectly and tightly. It can also stand on your table or desk. Very convenient.