Specifications: Silicone pipe, various shapes; The light is 5500K adjustable, and the brightness is 3-level adjustable; Maximum brightness : 90 lumens; 2 super bright LEDs, power 1W; Battery: 400mAh(ternary polymer lithium battery); Charging voltage: DC 5V Charging time: about 50 minutes; Lighting time: 3-4 hours (Varies with brightness); Brightest time: about 4 hours; The red LED light is on when charging, and it will automatically turn off when fully charged; A charging cable USB is also included. Instructions: 1. The brightness is adjustable in 3 levels; 2. Long press the power switch for 2 seconds to turn on the light; 3. Press the power switch to change the brightness; The user can adjust the brightness according to the need to adjust the brightness. Ergonomic Design: Neck reading lamp, hands are completely 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.