HOGNYU Clip on Reading Light, Portable Rechargeable Battery Operated Book Lights,9 LED Desk Lamp with Good Eye Protection Brightness for Piano, Travel, Desk and Bed Headboard New version & adjustable:9 LEDs with 2 different brightness offers bright and no flicker light. Flexible arm can moved the way you want it.it's just what you are looking for! Rechargeable: 3 power supply modes: AC +USB +built-in rechargeable lithium battery.Built-in 1800MAH lithium battery. 4 hours full charged can last for about 10 hours using. Portable & lightweight: :Adjustable goose neck make it easy to carry especially when travelling.Good quality flexible goose neck enable you to fully adjust lighting angle, beams point any direction you want.can be powered by built-in battery. (NOTE: Battery can't be replaced) Protection against overcharging: Our LED light lamp has a built-in protection circuit. It will prevent overcharging, over discharging and short circuits without damaging the battery! Multifunctional lamp: USB light lamps provide natural daylight lighting and are extremely energy efficient. Ideal for reading at home, desk work, the living room or the floor! Perfect for the office, net surfing, executive desks and presentations. Suitable for college dorm rooms, teachers, students, book lovers and you of course!