Features: 1) Economy: uses AAA battery which can be changed easily and bought easily;while old LED light pen is only by use of button cells 2) High capacity: the capacity of AAA is much higher than button cells, one piece AAA battery can last 20 hours 3) Extra light: by use 2 extra white on the tip of pen; while old LED is only by use of color LED and in the middle of pen which can not be used for lighting 4) Environment protection: both battery and ball pen care can be changed; while old LED light pen is disposable and one-time use 5) Easy to be carrying: light as normal pen with clip, can put into pocket 6) By use of high capacity gel-ink pen core, writing smoothly, long time use