We are a leading manufacturer of the digital door lock located in Korea. Keyless door lock security - our model Ark-Key. It has universal applications ideal for the fireproof steel, wooden and tempered glass(single & double) doors. Program the digital door lock with your pass code of up to 20 digits long and gain access by simply punching in the pass code to unlock the door. Programmed to open by entering even any random imaginary number prior or/and posterior to pass code, never reveal users pass code to nearby person when pressing buttons. Just one-touch operting. Diverse functions for users convenience; Tamper proof, Auto Re-lock function, Double lock function, Backlighting for use at night. Beef sound identifying keypad entry and setup function, I/R remote control, Self-diagnostic function, Long lasting by minimizing battery consumption and low battery alert etc.. If you get it from us, you can count on it to protect you and your loved ones, your home, apartment or dorm, and your business--for years to come