The rule finally holds itself
One fingerprint-only door knob, so the room stays off limits without you saying it twice.
Ships in 1 to 2 days · 90-day money-back guarantee- Only opens for a fingerprint you've actually added, up to 20 of them
- Re-locks itself automatically 5 seconds after every use
- Every fingerprint is stored 100% locally, never in a cloud
- About 6 months per charge, over a simple USB-C cable
You've already said it a hundred times
The rule was never the problem. A regular doorknob turning exactly the same way for a five-year-old as it does for you, that's the problem.
The rule never held because the door had nothing behind it
Add a fingerprint for every adult
Enrollment happens through the app, not at the knob itself, so only whoever holds the app can add someone new. Up to 20 fingerprints fit.
Only an enrolled fingerprint opens it
No fingerprint on file, no entry. A password, a key, or the app still work as backups, so nobody gets locked out over a dirty or wet finger.
It locks itself back up
Five seconds after every use, the knob re-locks on its own. Nobody has to remember to check it.
No battery worries, about 6 months a charge
Charges fully over a standard USB-C cable. A blinking light and an app alert warn you well before it ever actually dies, and a physical key or a portable power bank both work in a pinch.
What actually changes once it's on the door
“We stopped having the same argument about the attic door. It just doesn't open for him anymore, and that's the whole point.”
Placeholder customer
Only the fingerprints you add ever get in
New fingerprints get added through the app, not by pressing a finger to the knob itself. So a curious kid can't just walk up and enroll their own. Up to 20 prints, managed entirely by whoever holds the app.
Never hunt for a hidden spare key again
Fingerprint, password, the app, or the two physical keys that come in the box. Four ways in, so nobody's ever stuck outside because the one method they rely on didn't work that day.
Charges in hours, forgets about itself for months
A few hours on a USB-C cable is good for roughly 6 months of normal use. A low-battery alert hits your phone and the knob itself blinks red well before you'd ever actually get caught out.
Built to keep working, not jam shut
A physical key and a hidden mechanical key port are always there as backup, so a dead battery or a stuck sensor is never the same thing as being locked out of your own room. Backed by a 1-year warranty.
The conversation you don't have to have again tomorrow
“I don't have to stand there and watch the door anymore. It just doesn't open for him.”
Placeholder customer
“We tried a sign taped to the door first. This is the first thing that's actually worked.”
Placeholder customer
“Installed it with one screwdriver I already had. Ten minutes, done.”
Placeholder customer
Built for the reasons the other fixes didn't hold
A sign only works if it's obeyed
A rule written on paper has no way to stop anyone. TrueLatch doesn't ask for cooperation, it just doesn't turn without an enrolled fingerprint.
A shared code can always be passed along
Codes get repeated to a friend or guessed eventually. A fingerprint can't be casually handed off, which is why it's the default here, not an afterthought.
A jammed motor shouldn't lock you out
Smart locks can fail. That's exactly why TrueLatch always keeps a mechanical key override available, backed by a 1-year warranty if something does go wrong.
Your fingerprint data isn't going anywhere
No cloud account required to unlock a door every day. Every fingerprint match is checked and stored locally on the knob itself.
| What matters | TrueLatch | A sign or spoken rule | A shared-code lock |
|---|---|---|---|
| Stops the rule from being ignored | Only enrolled fingerprints open it | Only works if it's obeyed | Works until the code gets passed along |
| Can be shared without meaning to | A fingerprint can't be handed off | Not applicable | A real, common risk |
| Setup | Standard screwdriver, well under 5 minutes | None | Similar install |
| Locked-out risk | 2 physical keys plus app, always available | Not applicable | Depends on the model |
One price, nothing else to add
- TrueLatch fingerprint door knob Included
- 2 physical backup keys Included
- Mounting hardware and screws Included
- Quick-start install guide Included
- Free companion app access Included
- 1-year warranty Included
- 90-day money-back guarantee Included
Questions parents actually ask us
What happens if the battery dies and I get locked out?
It won't sneak up on you. The knob blinks red and your phone gets an alert well before the battery actually runs out. If it ever does die, the two physical keys that ship in the box, or any portable power bank plugged into the USB-C port, get you back in.
How long does the battery actually last?
About 6 months of normal, everyday use on a single charge, which takes a few hours over a standard USB-C cable.
Can my kid just add their own fingerprint and get around this?
No. New fingerprints and codes are added through the app, not at the knob itself, so only whoever holds the app can grant access. Up to 20 fingerprints can be stored at once.
What if someone shares the code with a friend?
Fingerprint is the default and primary way in for exactly this reason, since it can't be casually handed off. Codes are optional, and can be set as temporary or single-use through the app if you do want to share one.
Is it hard to install? Do I need a locksmith?
No locksmith required. It's a standard screwdriver install that fits most single-cylinder doors, typically done start to finish in well under 5 minutes. It is not compatible with mortise locks.
What if the fingerprint sensor doesn't recognize a wet or dirty finger?
Fingerprint is one of four unlock methods. The keypad, the app, and the physical key are always available as a fallback, so you're never stuck relying on the sensor alone.
Is my fingerprint data stored somewhere online?
No. Every fingerprint match is checked and stored 100% locally on the knob itself. There's no cloud account required for everyday use.
Will this actually fit my door?
It fits standard doors 1-3/8″ to 2-1/8″ thick, with a 2-1/8″ door hole and a 2-3/4″ or 2-3/8″ backset, and is compatible with single-cylinder setups. It is not compatible with mortise locks, so it's worth double-checking your door's hardware before ordering.
What if it breaks like some smart locks do?
It's backed by a 1-year warranty and our 90-day money-back guarantee, so a manufacturing issue is on us to fix, not something you're stuck with.
What's your shipping and return policy?
Orders process in 1 to 2 days and typically arrive in 5 to 10 days after that. If it's not right for your door or your household, you have 90 days to send it back for a refund.
Short version, from people using it daily
“Ten minutes with one screwdriver and it was done.”
Placeholder customer“The app notification is the part I didn't know I needed.”
Placeholder customer“No more hunting for the spare key I hid too well.”
Placeholder customer“First fix that actually held past week one.”
Placeholder customerLet the door hold the rule for you
TrueLatch, $49.99. Ships in 1 to 2 days, backed by a 90-day money-back guarantee.