This pen use to correct flash stamp foam,when you press the white switch,then thehead of this pen will become very hot after 10 seconds,it is about 100 degree Centigrade,don't use your hand to touch the head of the pen. Its energy source come from two battery.when you use flash stamp machine to flash the flash stamp foam,maybe the surface of the flash stamp foam is not very perfect,then you can use this pen to correct the bug.