We provide optical sensor fingerprint locks thatcould be used in internal and external doors. We have sold over 3000 units of 3GVLF-L2-01 fingerprint lock to USA. And our 3GVLF-6815-02(internal door lock) and 3GVLF-8816-04 are made of stainless steel and very beautiful.Our safety-deposit boxes are popular in China and we could made it for customers according to customer's requirements. Website: www.cn-3gvisions.com (being improved)