This is a good start, the world for her coming lit up all the lights in between heaven and earth, she picked up the breeze of the pen, draw the mind carpet of flowers of the earth.

Users rub the bottom of the "pen" back and forth across two different spots on a bill, and indicator lights signify whether magnetic particles are embedded in those areas.

And ball-point pen, it's both sides respectively, there are two small lights, is on the night of the power outage, it can also help you write your homework;