Desk lamp that works either with batteries or a USB connection (does not charge)

Eye protection study table lamps Made of abs, lightweight, durable and smooth texture feeling, Efficient heat dissipation ,adjustable angle. It's powered by usb charger, usb power bank or laptop, so it is convenient when you want to use it, for bedroom, reading room, home, Battery backup time - 30 minutes, no more long tangling cords, use it cordlessly and take it anywhere you want, Press Long Touch for dimmer and Brightener. Press single touch for on/off