USB 5 volt LED light can be carried and used by plugging into a battery/power bank. Simple to use and does not drain your power supply. You plug this into a standard USB port and this instant light gives you 80 lumens for reading etc.
 
It throws out 6000K xenon of cold white light and only measures 23mm in length,12mm in width, 3mm thick and weighs only 1.2 grams. Each Mini Portable USB LED Light equipped with 3 high quality 2835-SMD LED chips.