This neck light is very comfortable and easy to use. It's rechargeable using USB, and you can use one light, two lights or four lights to brighten up whatever you may be doing. Each end has two (2) light in it, and clicking the power button once will light up one (1) light, two cliks will light up two (2) light and 3 clicks will light up all four (4) lights. I highly recommend this product for anyone.