Protecting your eyes when you work for repairing field. this table lamp comes with high-frequency 4200Hz lamp without frequent sparking for avoiding harmful to eyes after long-time working, since long time work under deficient light at normal 50Hz/60Hz can cause short eyesight and many eye diseases. and the 2 to 10 times magnifier brings the work up close to you for much easy working. It is very useful tool for people who is doing repairing business. Warranty 12 months