The lamp has a built in battery and is rechargeable. It uses a round connector rather than a micro usb, so you need to hang on to the cord, if you misplace it you will not be able to recharge the lamp.
If you touch the base quickly you can turn on an off the lamp with one touch. If you touch and hold the light dims or brightens slowly. The spot light the lamp generates is not larger, but enough to light a book. Overall, pretty nice book light.
You can find it on Amazon by following this link.
Ali Julia review ★★★★★