Go touchless with NB-IoT deadbolt attachment lock

Touchless, keyless entry without changing your locks 


Smart access without changing your locks

You can now get connected access control for your home just like in offices and hotels without having to change your locks. Our NB-IoT deadbolt attachment installs over your existing deadbolt on the inside of your door in a minute, with having to screw or drill into your door or change your existing locks.


Make your home more secure


Narrowband Smartlock is easy to install - you don’t have to replace your existing door lock (or your keys), and you don’t need a professional. All you need is a screwdriver and a few minutes!

Easy install on the inside of your door

Connect to the global IoT network

With tiny modems (NB-IoT modules) and iSIM cards inside our smartlocks we connect to the internet with NB-IoT communications technology (part of the 5G standards) so you can get the best security and convenience.


Julie Pritchard



When a delivery driver arrives at your house with your package, they scan the smartlock QR code on your door, and the package barcode to trigger an unlock command. Your door unlocks just once, and your delivery driver slides your package into your house without setting a foot inside.  

Safely receive parcels inside you house

Always alert like an alarm

NB-IoT smartlock senses any door movement (e.g vibrations) when it’s locked. You’ll receive a notification anywhere in the world if anyone tampers with your door, or tries to force your door open so its like having a monitored alarm installed. 

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How Digital Keys for Deliveries Works


1. Enter tracking number

Copy/enter your tracking number into the digital keys app


2. Driver scans QR code

Delivery driver scans your smartlock QR code on your door 


3. Driver scans parcel

Delivery driver scans your parcel bar code


4. Dook unlocks

If scans match, your door unlocks, and delivery driver slides your package inside

Frequently asked questions 

Will Narrowband Smartlock work on my lock?

Narrowband smartlock works on most standard single cylinder deadbolt locks (which operate independently from your knob/lever lock). If you need to use a key to lock your deadbolt on the inside of the door, then you have a double standard deadbolt (Narrowband Smartlock will not work on double cylinder deadbolts). But you can easily replace to a single cylinder deadbolt at your local hardware store for $10-$50. See compatibility diagram below. If you are still unsure, please send us an email info@digitalkeys.io

Can I still use my original key or manually lock/unlock the door

Yes, of course. Your deadbolt lock cylinder remains how it was before on the outside of your door, and you can still use your metal key. You can also turn the Narrowband Smartlock to unlock your door when leaving.

Will the NB IoT smart padlocks work in my country?

NB IoT networks have been rolling out in dozens of countries across the planet. Please check our page 'NB IoT Network Map' for country rollout details. Also please send us an email with your country and we will chase up with our telco partners about NB IoT network availability around you.

Do I have to change my locks to install Narrowband Smartlock?

No you don’t change your locks. All you have to do is screw Narrowband over the top of your existing deadbolt on the inside of your door. It’s a deadbolt attachment!

Do you have discounts for bulk volume purchases?

Yes, please email us at info@digitalkeys.io to discuss your needs and wants.

How do you get such a long battery life (around 2 years) as compared to only a few months with other connected locks (e.g Wi-Fi/BLE)?

Our locks remain in sleep mode most of the time, conserving battery, and are only woken up for a couple of seconds when you need to use the lock (e.g to unlock it, get live audit). All other connected locks are constantly on and connected to the internet sucking up battery life.

Where does the data lie, and who controls the data of the NB IoT smartlocks?

Our cloud servers are hosted at Amazon Web Services (AWS) in your local country. No one has access to your data except you. If you want to host the system on your local servers, please get in touch with us to discuss further at info@digitalkeys.io

Where is my data held and who controls it?

Your data is safely secured and managed at your telecommunication Company who you sign up with for the connectivity services. All our smart access system services and data rests with the telecommunication companies who follow strict data legislation, standards and policies to ensure the highest levels of data security, privacy and integrity. If you can trust the telecommunication companies with your mobile phones, and mobile data, then you can trust them for NB IoT smart access.

What if my phone runs out of batteries?

You can always still use your metal key to open the door – the Narrowband is installed on the inside of your door over your deadbolt, the locks on the exterior of the door remain the same. Alternatively, you can also use a friend or neighbor’s phone to download the app, use your login to the app to unlock your door, and then delete the app. You can also use the provided keycards, fobs, stickers and rings to unlock, which are programmed to work permanently and ongoing for your Narrowband Smartlock. If you want to make time limited keycards/key tokens, you can use the Digital Keys app.

How difficult is it to install the different pieces of Narrowband?

You can install all the parts of Narrowband smartlock in minutes with only a screwdriver. See image below.

What if the power goes out?

Narrowband Smartlock runs on 4AA batteries, it does not require mains power.

What if the Narrowband smartlock runs out of batteries?

Narrowband smartlocks battery life is about 2 years (5-8 unlocks a day). It will keep notifying you through app when batteries are low. If the batteries run out, you can still use metal keys to unlock your door (perhaps use your current method of having a spare key with a family or trusted friend.

Are there monthly fees to use Narrowband Smartlock?

No - not for 2 years. The Narrowband smartlock comes with 2 years of connectivity to your local telco’s NB IoT network and SIM cards included – so there are no monthly fees. After 2 years, if you want to continue to use the connected services and connected features (such as live event notifications, tampering alerts etc) you can purchase more connectivity on 1 2 5 or 10 year plans (we won't know the cost in 2 years time, and the cost varies from telco to telco and country to country). But what we do know now is that the pricing for NB IoT connectivity is very low as Narrowband uses such low data (for example an unlock command over the NB IoT network is only around 8 bytes). Some telco’s have very low data plans such as only 10 Euro’s for ten years from Deutche Telekom As data costs are so low, maintaining the server service and making it secure are not extensive at all.

How many Digital Keys can I make and send to others?

There are no limits to the amount of digital keys you can generate and share with others. You are in control of who you want to “authorize” and for how long/specific dates and times/regular dates and times. You can also cancel the digital keys at anytime in seconds in the apps and software

How many Narrowband Smartlocks can I manage/control simultaneously?

You can manage as many Narrowband smartlocks as possible on just the one account. This makes it easy to manage multiple properties and multiple doors. Such as in offices or for managing lots of rental properties. You can connect new locks to your account at anytime too - you can try one door, and add more later if you like. You can group doors on one site, in one app, and even find sites on maps (for PC based software account). There is no setup involved by you. We connect to your account when we ship.

What is the warranty and return policy?

We guarantee that Narrowband Smartlock will work for your door if your lock is a single cylinder separate deadbolt. We refund you 100% in case of product defect or incompatibility - we don't think it will happen though :) The product also comes with a 2-year warranty.

How secure is Narrowband smartlock? Can it be hacked?

All other technologies used in smartlocks have been hacked but not the technology we use – which is NB IoT. This technology has been built specifically for use in smart devices, and has many levels of security features and encryptions throughout.

Can I use Narrowband Smartlock on common doors, such as the front door to an apartment building?

Yes – this door will need a single cylinder detached deadbolt though, and we also suggest you get the building owner approval for this. If you would like this feature, please email us to notify that this is its intended use, so we can set up the product properly.

Is Narrowband Smartlock waterproof?

No, its not waterproof, because it installs on the inside of your door, in the inside of your home/building, where there is no rain, or snow, so its does not need to be waterproof and its in a safe position, where no-one can tamper with it.

Where can I learn more about Narrowband IoT network?

You can learn more about NarrowBand IoT at the GSM website here https://www.gsma.com/iot/narrow-band-internet-of-things-nb-iot/

Is there a developer API? Can Narrowband be connected to other smart devices?

Yes! We have an API that is available for developers to build their own integrations to their own products/services. For companies looking to integrate their buildings with Narrowband smartlock, our developers can support you, please email us info@digitalkeys.io for more information.

What are the smartphone requirements and other requirements for Narrowband Smartlock?

To use the Bluetooth auto-unlock feature, you will need Bluetooth 4.0 or higher on your phone (Android 4.4 or higher and iPhone iOS 8 or higher (iPhone 4S or newer)) To use the ‘write to token (keycard, fob, sticker and ring)’ feature, you will need an Android phone with Host Card Emulation (HCE). To see a list of HCE Android phones go to https://www.digitalkeys.io/smartphone-apps All our supplied tokens come with unlimited use so you can use your tokens immediately. You will only need the Android HCE phones if you intend to make tokens time-sensitive and on a regular basis (such as in a hotel use). We will ensure NB IoT is switched on and working well near your address. Simply download our app in the online App store (iPhone) and the Google Play store (Android) and you can start using all the features of Narrowband Smartlock.

What batteries does Narrowband Smartlock use?

4 standard AA batteries. You can get the standard batteries in any supermarket.

Is Narrowband Smartlock compatible with Apple Homekit?

No. The concept of Narrowband Smartlock is not to use Wi-Fi or be compatible with hubs or kits that rely on Wi-Fi, as Wi-Fi is expensive, unreliable, has blackspots and requires onsite network infrastructure and equipment.

What's in the Box​

1 x NB IoT smart lock

NFC keycards for NB-IoT smartlocks

3 x NFC keycards

iSIM card for NB-IoT smartlocks

1 x iSIM Card +

30MB pre-paid data*

Door open close sensor for Narrowband Smartlock

1 x door open/close sensor

You'll also need.....

To download the FREE Digital Keys App to activate your SIM card and subscription. You'll also need 4 AA standard alkaline batteries which you can get in any supermarket.

NFC keycard reader for Narrowband Smartlock

1 x NFC card reader


Technical Specifications


Diameter 9.85cm 

Width 4.85cm

Weight: 500g


Aluminium body/mounting plate

ABS plastic battery cover



*Connects to the Global IoT network available in over 20 countries - see our list of available countries here

1 year (4 year extended warranty available POA)

NB-IoT (part of 5G standards), NFC Mifare (local opening with keycards and NFC phones) LTE-M, CAT-M (2G/3G fallback)
Nano iSIM (included) on participating local mobile network operators*
Telit 310gWW NB-IoT module
(see link here for bands/modes/approvals etc)

How it works.


Create your digital keys

You can program your smart padlock for time-sensitive use for various users with the Digital Keys app and/or access management software


Unlock inside app

To unlock your smart padlock push unlock/open button inside the Digital Keys app from anywhere in the world for maximum convenience


Receive event notifications

You get live instant notifications on your phone, tablet or PC of who opened which smart padlock at what time (and by what method) e.g app, PIN, card