Every Way to Unlock a Smart Lock: Fingerprint, PIN, Card, Face, Palm, App, Key

Most digital locks sold in Singapore unlock in at least four ways out of the box: fingerprint, a PIN code, an RFID card and a phone app. Gate-mounted models add facial recognition, and the newest flagship locks add palm vein scanning on top of that. A mechanical override key is common but, importantly, not universal.

This guide explains every unlock method you will see on a spec sheet, what each one is genuinely good for, and how to choose the right mix for your household. It is written from the perspective of installers who fit smart locks on HDB, BTO and condo doors and gates every week, so the advice leans practical rather than theoretical.

What are the ways to unlock a smart lock?

There are seven common ways to unlock a modern smart lock: fingerprint, anti-peeping PIN, Mifare RFID card, facial recognition, palm vein, the Tuya or Smart Life app, and a mechanical key on models that include one. No lock needs all seven; most households settle into two or three per person.

Here is the whole menu at a glance. Note that only the app depends on WiFi; every other method works fully offline.

How does fingerprint unlocking work day to day?

Fingerprint is the method most people end up using for the vast majority of entries: press a finger on the sensor and the door opens, typically in under a second. It is faster than finding keys, and there is nothing to carry, lose or remember.

Modern sensors let you enrol several fingers, and most locks store dozens of fingerprints, often around a hundred. Our installers usually enrol at least two fingers per person, one on each hand, so a plaster or a paper cut never locks anyone out.

The honest caveat: fingerprint reads less reliably for a small minority of users. Very dry skin, prints worn down by manual work or age, and young children with small fingers can all cause misreads. If that describes someone in your home, pair the lock with a card or face unlock instead of fighting the sensor. For a deeper look at the two headline biometrics, see our fingerprint vs facial recognition guide.

What is an anti-peeping PIN and why does every household need one?

An anti-peeping PIN lets you bury your real code inside a longer string of random digits, so anyone watching from the lift lobby cannot copy it. You might type four random numbers, then your actual code, then two more random numbers, and the lock still opens.

We treat the PIN as the essential backup for every household. It costs nothing to set up, it works when fingers are wet from the rain or oily from cooking, and it is the one method that needs no phone, card or cooperative biometric. Most locks also freeze the keypad for a while after repeated wrong attempts, which blunts guessing.

Two habits worth keeping: change the code occasionally, and never use birthdays or your unit number. Where the lock supports multiple user codes, give helpers and contractors their own, so you can delete theirs later without touching your own.

Who should use a Mifare RFID card?

The Mifare RFID card is the easiest method for anyone who struggles with biometrics or apps: tap the card on the reader and the door opens. Locks typically come with a couple of cards, and extras are inexpensive.

In our installs, cards shine for three groups. Young children, who may not reach the sensor comfortably or whose small fingerprints misread. Domestic helpers, who can be issued a card you cancel when it is no longer needed. And elderly parents, for whom tap-to-open feels more familiar than any touchscreen.

The obvious trade-off is that a card can be lost. Treat it like an EZ-Link card: keep it in a wallet or on a lanyard, and if one goes missing, delete that card from the lock the same day. Removing one card never affects the others.

Is facial recognition worth it at the gate?

Facial recognition earns its keep at the metal gate, where you walk up face-on with both hands full of groceries or a sleeping child. The lock verifies your face and opens without you touching anything. In most HDB and BTO flats the metal gate sits in front of the wooden main door, which is exactly why camera-based features live on gate models such as the Touch 200 Pro and Touch 300 Pro rather than on slim door locks.

Face unlock works day and night on current models, which typically use infrared sensing rather than a plain camera, so corridor lighting matters less than people expect. It suits adults better than fast-growing young children, whose faces change quickly enough that you may need to re-enrol them now and then.

If you are still deciding where the lock should go, our gate or door guide walks through the layout question in detail.

What is palm vein unlocking and who has it?

Palm vein is the newest method in the range and currently appears only on the Touch 300 Pro, the flagship gate lock with a 1080p doorcam. You hold your palm a short distance above the sensor, and an infrared reader maps the vein pattern beneath your skin.

Because the pattern sits under the skin rather than on it, palm vein is largely unaffected by wet hands, dry skin or surface wear, the exact conditions that trip up fingerprint sensors. It is also contactless, which some households simply prefer, and vein patterns are considered very hard to copy compared with surface features.

Think of it as the fallback biometric for people whose fingerprints misread, bundled into a premium lock that also offers face, fingerprint, PIN, card and app unlock in one unit.

What can the Tuya or Smart Life app actually do?

The app, Tuya or Smart Life on WiFi models, is less about daily unlocking and more about control. From your phone you can unlock remotely for a family member who forgot everything, issue a temporary PIN that expires the same evening, review a log of who came home when, and get an alert when the battery runs low.

Temporary codes are the sleeper feature. Instead of hiding a key under the mat for the aircon technician, you send a one-off code that stops working after the visit. Parents also use the entry log to confirm the kids arrived home from school.

The app is the only method that depends on WiFi, and most locks connect over the common 2.4GHz band. If your network drops, every offline method keeps working exactly as before. Our battery, power and WiFi guide covers the setup side.

Do all smart locks have a mechanical key?

No. Most models hide a keyhole under a cover for emergencies, but some premium facial recognition gate locks and certain push-pull designs ship without one entirely, relying on PIN, card and an external power contact instead. Check your shortlisted model before you buy.

Just as important: a physical keyway is a convenience, not a security feature. On any lock, digital or traditional, the cylinder is a known weak point, which is partly why manufacturers conceal it or leave it out. Use it as the emergency backup it is meant to be, never as your daily entrance. Our article on whether digital locks are safe goes deeper into lock security overall.

If your model includes keys, store one outside the home, with a parent, a sibling or in your office drawer. A backup key sitting inside the flat cannot rescue you from the corridor.

How many unlock methods do I actually need?

Enrol at least two unlock methods per person, chosen so the failure of one never strands anyone outside. That single rule matters more than which specific methods you pick.

The combinations we set up most often look like this:

• Working adults: fingerprint for daily use, PIN as backup, app on the phone for good measure.
• Children: an RFID card on the school bag lanyard, plus a PIN they memorise.
• Elderly parents: a card or facial recognition for ease, plus a PIN kept written down in a purse.
• Helpers and part-time cleaners: their own card or code, issued individually so it can be revoked cleanly.

A four-person household rarely needs palm vein, face and fingerprint all at once; the options exist so that every kind of hand and every age group has something that reads reliably. Buy the mix your people will actually use, not the longest spec sheet.

Every OpenTouch lock covers the core mix of fingerprint, anti-peeping PIN and Mifare card, with app control on WiFi models, facial recognition on the Touch 200 Pro, and the full set including palm vein on the Touch 300 Pro. Prices run roughly S$319 to S$459, GST-inclusive at 9%, with free certified same-day installation across Singapore and a 2-year local warranty. Browse the range at the OpenTouch store, or start with our complete buying guide if you are still comparing.