Ergonomic Design: Neck reading lamp, hands are totally free! The arms are soft and adjustable so you can get the most comfortable angle for yourself. 3 Adjustable Brightness Levels: 2 ultra-bright LEDs provide you with sufficient light. 3 Brightness Levels provide you with an appropriate light source for your needs. You could adjust the brightness by switch button. Rechargeable and Durable: with USB Cable(included); The built-in 400mAh rechargeable battery has a lifespan of 3-4 hours (Varies with brightness) after fully charged. It takes about 50 minutes to be recharged. (Note that this neck reading light can only be charged by 5V adapter. ) Portable: Neck reading light is light and small, easy to carry. Versatile Use: Hang it around your neck, enjoy your reading in bed or in the car. Perfect for an outdoor BBQ, nighttime walking or jogging sessions. Ideal for reading, office, work, book, travel etc.