bitlock mini is an add-on auto-lock that can be installed in rental properties. You can open and close the lock from a smartphone app. There is a function that automatically unlocks when you return home, but only for Android users. bitreader+ works with bitlock mini and allows you to unlock with an IC card, smartphone touch, or passcode. bitlink works with bitlock mini and Wi-Fi, allowing you to remotely unlock the door and check the status of the lock. I am selling this because I no longer need it due to moving. The bitlock mini comes with replacement adhesive stickers, so please use them to replace the old ones. Please note that you may not be able to initialize the device on an iPhone. In that case, you can contact the manufacturer to request assistance with initialization. Replacement batteries are included.