Smart Internal Door Lock with Fingerprint: Installation Guide

Question: How do I install the Smart Internal Door Lock with Fingerprint?

Answer:

1. Charge battery fully using USB-C cable (up to 3.5 hours).

2. Remove existing lock — ensure it’s single-cylinder type.

3. Install latch:

   • 60mm backset: use as-is

   • 70mm backset: extend before inserting

   • Secure with screws

4. Install strike plate:

   • Use existing if bolt moves freely

   • Adjust position if not smooth

5. Install exterior knob:

   • Insert spindle through latch hole

   • Position knob on outside

6. Mount interior knob plate:

   • Use unlocking pin to remove knob

   • Align UP arrow

   • Use hand-tightened bolts (no power tools)

7. Attach interior knob:

   • Align latch direction

   • Press into mounting plate