Electronic door lock. Access via code or Bluetooth 4.0 using a mobile app. The app also allows you to create temporary access codes. It can be fully unlocked and functions as a simple door handle. No drilling, sawing, or wiring is required - installation only involves replacing the existing door handle. Secure installation with a conventional lock - provides access even when the device is completely discharged. Suitable for various types of doors, such as office doors, interior doors, rental doors, composite doors, or any doors where keys are not practical. The keypad lights up red when the battery is low. Compatible with both right and left-handed doors.