It is easy to find out the difference between our fusion power razors and other seller's poor razor.(1) Our razors have the serial NO. on the each razor head, other seller's poor quality not.(2) Our razors have the barcode NO. on the plastic carrier case, other's not.(3 (3) Our razors have the elliptical hole point on razor head, the poor quality is the small circle point.(4) Our razors are sharper and long-term use, the poor is blunt and easy get rust.