Feature:

* User code or Bluetooth unlocking.
* Powered by 1pc cell button battery, it can last 1 year .
* Compatible with iOS (iPhone) and Android smart phone.
* Suitable for both metal and wood cabinets.
* App management.
* Short of batery: There is signal of beep beep if short of battery.
* Power run down: if the battery is completely run down, user can simply use the power bank to supply power to the lock and replace the battery. 
* Easy to install