Scope of delivery: 1 neck drive, 1 C-cable. Product material: ABSandsilica gel Product color: black Battery capacity : 1800mAh Product power:< 2.5W Tricolor light source: white light or warm light or warm white light Product weight: 150g Three colors and adjustable brightness: there are three modes of warm light, warm white light and white light, which can be gradually adjusted from 100 percent to 10 percent brightness as required Rechargeable and environmentally friendly: The built-in 1800mAh battery can only be used for 8- 80 hours with 100 percent brightness after full charge. It has a charging interface to reduce the charging cost. Buy batteries, reduce the production of waste batteries, and be more environmentally friendly. Comfortable and adjustable arm: The ergonomic neck support can be adjusted to any angle to fix it on the neck, so it will not move freely and will support the neck comfortably. It can also be used as a desk lamp. Desktop use, can be used on the desktop. It is also very suitable for reading, knitting, camping and handcrafting. You can do anything without using your hands. Eye care, do not disturb others: Children and adults are more likely to get tired of their eyes, and your target area is bright enough without disturbing your sleeping partner. Adjusting the brightness can reduce the range of light without affecting your reading or sleeping partner. It can be used as a gift for your boyfriend or child, so they can have different LED necklace reading lights Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.