New Delhi, Dec. 9 -- Smart locks make home security easier and more convenient. They allow you to lock or unlock your door using your phone, a keypad, or even your fingerprint. Some can automatically lock when you leave or unlock as you approach. However, there are many models with different sizes, features, and technologies, which can make choosing one confusing. This guide explains what to consider when picking a smart lock, including installation options, control methods, unlock features, communication protocols, battery life, and automations.

Smart locks come in two main installation types: retrofit and full replacement.

Retrofit locks attach directly to your existing deadbolt. They are easy to install, inexpensive, and great for re...