1.Advanced 4-in-1 Keyless Entry Smart Door Lock:Fingerprint + Anti-peep virtual password + Smartphone + Physical Key(2 include).One Touch Fingerprint Access,read your fingerprint,and unlock your door.It can auto relock your door for you so your home is always safe.2.Low battery alarm on TT Lock App(Free APP),with emergency power interface and backup key.When the power is critically low or the battery is completely drained,don't worry,use the backup key to open the door,micro USB power bank also can be a temporary power supply.Never be locked out.3.The adjustable dead bolt has a size between 60mm to 70mm,is suitable for doors with a thickness of 35-50mm.Simple Door Handle settings,suitable for various scenarios,replaces standard single-cylinder U.S. door locks,fits both left and right,inner and outer.Easy to install in minutes by following short installation video.4.You can create virtual keys to share with people you trust-set them as permanent keys or to a schedule,Lock/Unlock,grant access to others and see who comes and goes from anywhere using smart door lock is a great solution for short-term rental hosts,self-housing resident and attendance management.