This door features: 1.)a 9x9 pin 4 digit pin lock. 2.)reset button 3.)no limit on how long it takes you to put in the pin 4.)wrong number the door locks (that's why there is a reset button) 5.)confirm button for the pin u just entered 6.)the door resets after you open it (redo pin to open again) 7.)and many other little stuff. Please report any problems you have