About this item 3 colors and adjustable brightness Rechargeable and Eco-friendlyBuilt-in 1800mAh battery, when fully charged , it can only be used for 8-80 hours at 100% brightness, with a charging interface, which saves charging costs. Buy batteries, reduce the production of waste batteries and be more environmentally friendly. Comfortable and adjustable arms The ergonomic neck support can be adjusted to any angle to fix it on the neck so that it does not move freely and holds your neck comfortably. It can also be used as a desk lamp. Tabletop use, can be used on the desktop. It's also great for reading, knitting, camping, crafts, and completely hands-free when doing just about anything. Care for eyes, no disturbing others No more eye strain for kids and adults, bright enough for the area you are locating, without disturbing your sleeping partner. Adjusting the brightness can reduce the range of light without affecting your reading or sleeping partner. It can be given as a gift to your boyfriend or your kids so that they can have different LED necklace reading lights the black color Components included, including the batteries LED light source type Battery powered plug type switch style button