A. About this product 1. Rechargeable and durable: It uses a USB Type - C charging interface, which supports reversible insertion. Compared with other Micro - USB interfaces, it is more convenient to plug and unplug. The equipped 1000mAh rechargeable battery can provide up to 80 hours of strong, flicker - free lighting under normal reading conditions with a single lamp head in use. 2. Three - color light and six - level brightness adjustment: It has three practical color temperature modes, namely yellow (3000K), warm white (4000K), and cold white (6000K). Each lamp head has an independent switch and can achieve three - level brightness adjustment. You can choose a comfortable lighting setting according to different scenarios such as reading, knitting, camping, or repairing. 3. Eye - friendly design and ergonomics: It uses advanced LED lamp beads, which are flicker - free and have a blue - light filtering function. Whether used by children or adults, it is less likely to cause eye fatigue. The lamp arm is flexibly adjustable, and you can adjust it to a comfortable angle. It adopts an ergonomic neck - wrapping design, which can free your hands. 4. No disturbance to others: It uses a special narrow - beam (90°) angle design, which can provide sufficient lighting for the area you are illuminating without disturbing your resting companions due to overly bright light. 5. Product guarantee: It has applied for the original patent and passed the FCC, CE, RoHS, and PSE certifications. It offers an 18 - month warranty and customer service. The product packaging box includes: 1 Glocusent LED neck lamp, 1 USB Type - C charging cable (24 feet), 1 user manual, and 1 bookmark. B. Precautions Please use the included Type - C charging cable or a third - party certified charging cable. The product does not include an AC adapter.