3 Colors & 6 Adjustable Brightnesses Unlike other reading lamps in bed, Glocusent 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; cool white for precision sewing or crocheting. Rechargeable & Long Lasting Compared to other Micro-USB book lights, our USB-C rechargeable LED book light is user-friendly and safer for old people 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-dimming light. Eye Care & Ergonomic Design Our book reading light does not produce flickering or glare light, save you from eye strain, it is a reading lamp for reading in bed at night. Additionally, the night reading lights feature an ergonomic shape, clinging to your neck; the 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. Note: Data is manual measurement, please allow 1-45cm error, due to light and screen differences , there will be a certain color difference, the specific received in kind prevail.