Before you buy, please note:
US Standard. This lock is for the door thickness is between 38mm ~ 48mm (1.5 inches ~ 1.88 inches).
Preparation Guide for Door with Existing Holes:
https://ae02.alicdn.com/kf/S1509cd8e16a7409aa34f568c83a91d7aB.jpg
Operating Temp Range: -4℉~158℉ (-20℃ ~ 70℃)
Battery Requirement: 4PCS AA batteries (not included)
The following videos are for your reference:
1. How to Install Hornbill Smart Lock:https://youtu.be/nu-aGLm6yNg
2. How to Set up TTLOCK app for Hornbill Smart Lock:https://youtu.be/eEfsjfncLaw
3. How to Use Alexa to Control the Hornbill Smart Lock:https://youtu.be/btTkTbb9siI
5-in-1 Smart Lock:
Advanced Fingerprint, IC card, Passcode, TTLock APP control, Mechanical Key.
Remote Voice control with Alexa and Google Assistant (need a G2 gateway).