Colors and 3 Adjustable Brightnesses Unlike other lamps for reading in bed, the neck lamp has 3 useful color temperatures: yellow (3000K), warm white (4000K) and cool white (6000K). It has 3 brightness levels per arm and different combinations of reading light settings to suit your needs. For example, a yellow light for general reading a warm white to study a cold white for precision sewing or crocheting. Rechargeable and Long Lasting Compared with other Micro-USB book lights, our USB-C rechargeable LED reading light is user-friendly and safer for old and young people. That's because USB-C is a "one size fits all" design, easy to plug into any side. Additionally, the built-in 1000mAh battery provides up to 80 hours of battery life (depending on eReader lamp settings). It keeps you away from the daily burden with non-diminishing light. Eye Care and Ergonomic DesignOur book reading light does not produce flickering or dazzling light, save you from eye strain, it is a perfect bedside reading light at night. night light feature an ergonomic shape, clinging to your neck arms are soft and adjustable making it easy to adopt the most comfortable angle - an ideal lighting aid for hands-free activities. Compatible with partners This reading lamp has a narrow beam angle (90), which is low enough not to disturb people nearby. At the same time, neck lamp can illuminate the specific area you want to illuminate and emit abundant light without producing light disturbance for your partner. A perfect reading lamp for readers in bed.