1. Defect free, strong sturdy door lock. With k & ks quality certification. 2. Strong & durable body components. Made to withstand heat and electrical shocks. 3. Automatic lock ; relock ; dual lock features. Designed to fit consumer¡¯s security needs conveniently. 4. Random number feature. During pin number authentication, before or after entering pin number add another 4 digits to distract original number sequence. 5. Multi-touch number feature. 3 random number will appear on the screen before actual pin. 6. Multi password ; smart key registration function. Password : you can register pin number easily. Guest password : one time usage pin number for guest. Smart key : use the smart keys included in the set right after registration.(up to 30 keys can be registered) other compatible cards can be registered & used. 7. Auto cover authentication. The sensor cover opens and closes with just one touch for convenient authentication. 8. Adjustable volume setting with muting features. Sound can be adjusted in 7 levels depending on user¡¯s choice. 9. Highly visible white light button. Highly visible white light button for easy viewing even in dark places. 10. Emergency battery function (9v battery). When the battery is discharged, initialize the lock outside by using a 9v battery. 11. Anti-shock ; anti-fire ; anti-hacking system. Aside of anti-shock and anti-hacking feature 12. Sub-type door lock. No handle type door lock. 13. Specially designed for sliding door.