SMART CARD LOCK The Lock is made of pure - copper or stainless steel and is very durable. Use Siemens encryption techniques which is counterfeit preventing. Door-unlock-warning: this can warn the user and ensure 100% security. Can register 255 exclusive user cards and support offline network function. IC card can realize the independent locking for hotel or household. Front Size 73(D) x 80(W) x 214(H) Back Size 78(D) x 80(W) x 214(H) Maximum Cad key up to 50 Material Zinc Operation Power DC6V(1.5V AA Alkaline x 4) Application For Online : Optional Automatic Locking System For Re