Introduction

Not all ways of unlocking a door are built the same. If you're picking a smart lock for your home — or one that multiple people will use — how it verifies access matters more than you might think. Some methods are quicker, others more secure, and a few manage to do both. So, what should you rely on: a simple PIN, a fingerprint, or the high-tech scan of your palm veins?

This article breaks down how each method works, where it shines (and falls short), and how to decide what fits your lifestyle — and your front door.

1. PIN Codes: Simple but Risky

PIN codes are the most common and familiar method used on smart locks. Users enter a 4–8-digit number to unlock the door.

• Pros:
• Easy to share with guests and service providers
• Doesn’t require biometrics or an app
• Works even if your hands are full or dirty
• Cons:
• Easily guessed if too simple
• Can be seen by others over your shoulder
• Needs to be changed regularly to stay secure

PIN codes offer baseline protection, but they’re only as safe as the people who use them — and the numbers they choose.

2. Fingerprints: Convenient, but Not Foolproof

Fingerprint recognition scans the unique ridges and patterns on your fingertip. It's faster than typing a code and requires no memory.

• Pros:
• Quick, touch-based access
• No need to remember codes
• Works well for daily users in controlled conditions
• Cons:
• Doesn’t work reliably with wet, dirty, or aging hands
• Surface scanners can be fooled by lifted prints or smudges
• Multiple failed attempts may require backup methods

While widely used, fingerprint tech isn’t perfect — especially for families with kids or elderly members.

3. Palm-Vein Recognition: Secure and Touch-Free

Palm-vein recognition is the most advanced method among the three. It scans the unique vein patterns inside your palm using near-infrared light — a biometric that’s nearly impossible to forge.

• Pros:
• Touch-free, hygienic access
• Works with all hand types — sweaty, aging, even peeling
• 99.9% accuracy in just 0.17 seconds
• Cons:
• Requires specialized hardware
• Less common, so not all locks support it

Among all biometric methods, palm-vein stands out for its reliability and inclusivity. It works even in harsh conditions or with imperfect hand conditions — making it ideal for real-world families.

Authentication at a Glance

When Reliability Matters Most, Veins Win

Palm-vein authentication goes beyond surface-level recognition. Unlike fingerprints or facial scans, your palm’s vein structure is internal — nearly impossible to fake, and incredibly consistent throughout life. Plus, there’s no need to touch any surface, which helps with hygiene and accessibility.

This is why hospitals and high-security environments have used palm-vein tech for years — and now, Lockin brings it to everyday homes.

Want to see how it works in action? Check out the Lockin Veno Plus – Palm-Vein Video Smart Lock, which brings this cutting-edge authentication to your front door.

Which One’s Right for You?

• Prefer simplicity and easy sharing? PINs might be enough.
• Want fast daily access for yourself? Fingerprints offer convenience.
• Need a smart lock that works for everyone — young, old, and in between? Palm-vein is the clear winner.

Want to explore more options and compare Lockin smart locks? Click here to see which model matches your needs — from keyless entry to AI-powered video security.