[3 Colors & 6 Adjustable Brightness] Unlike other bedside reading lamps, Glocusent neck light 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 lamp settings to suit your needs. For example, yellow light for general reading; warm white for studying; cool white for precision sewing or crocheting. [Rechargeable & Long Lifespan] Compared with other Micro-USB book lights, our USB-C rechargeable LED reading light is friendly and safer for the elderly and young people. This is because USB-C is a “one-size-fits-all” design, easy to plug in any side. Besides, the built-in 1000mAh battery provides a battery life of 80 hours (depending on the reading lamp settings). It keeps you away from the daily burden with non-dimming light. [Eye-Care & Ergonomic Design] Our book light does not produce flickering or dazzling light, preventing you from eye strain, it is a perfect reading light