Threetop Corporation (Threetop Optical Electric Technology Co.,Ltd.) specialized in studying , designing ,manufacturing and selling of photoelectric and radiation products. Our company aim at the oversea market of laser and photoelectron market ,especially direct against the laser application field and power LED application field.and laser,we have reseached red laser module,green laser module,infrared laser module ,beam expander laser module and modulated laser module(including dot,ine,and cross laser module) hundreds of products and so on .The laser products are widely used in mapping apparatus, industrial point at ,laser distance finders,building put line, laser scanning,medical treatment,military affair,test teaching,light of stage,laser point at etc. field. The power LED used in AC/DC series,DC/DC series power LED driver illume lamps and lanterns and portable RCP.