Feature 1.Unique design with Patent protection 2.Stainless steel mechanism, lasting over 10 years 3.Noble shape and cleanness surface 4.Unlocked under IC card/Magnetic card directly inserted 5.Automatic locking system against dust with most precision interface 6.Adoption of Germany DDN technology, over 210,000 times work 7.Free rotating handle，prevention of the mechanism from violence 8.U-design handle for special choice maximum body protection 9. Easy replacement of the battery 10. Door thickness minimum 2.80cm