Already have a Locksure Hub? This is all you need for your next door.
A single monitor detects locking and unlocking from both sides of the door. Pairs with your existing hub automatically.
Technical Specifications
- ✓
Fits over the profile of exposed barrel (must be at least 1mm exposed)
- ✓
Single device monitors locking and unlocking from both sides of the door
- ✓
Connects to your existing Hub – no extra hub needed
- ✓
We recommend max 2 doors per hub (unless doors are very close together)
- ✓
Bluetooth Low Energy Radio – 5 to 7 metre range
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A replaceable CR2032 coin cell, typically 18 months depending on use
- ✓
Visual LED alerts to indicate lock/unlock actions
- ✓
Brackets included for barrel depth of up to 6mm
Hub Range & Placement
We recommend a maximum of 2 doors per hub for the most reliable performance – unless your doors are right next to each other (e.g. double patio doors). Each hub has a Bluetooth range of 5 to 7 metres – walls and floors reduce this. If your additional door is further away, consider a second Starter Pack, which includes its own hub for a separate zone of the house.
Customer reviews
Reviews from Amazon, Google and Trustpilot, plus reviews from early adopters, shown as the customer wrote them. Each one says where it came from and which model it was about. Thumb Turn and Key Turn monitors work the same way, but fit different locks.
★★★★★
I can check my doors locked whenever i want
Great product & efficient service
Posted on Amazon, 27 October 2026. Model: Thumb Turn (original). Verified Purchase on Amazon.
★★★★★
Good quality
A pretty cool system to prevent stress about thinking if the house doors were locked or not. Works via app and can be checked. Instructions on how to install and start using are all in the leaflet. Quality wise it looks secure on the door and works well.
Posted on Amazon, 20 October 2026. Model: Thumb Turn (Matter). Amazon Vine reviewer, product received free.
★★★★★
Awesome product, simple but very effective. I keep a display on my hall table. Before going to bed I have a quick glance to see if the doors are showing as green (locked). This gives me real peace of mind for my family and I. Best thing I have bought this year and I am not usually one for gadgets.
Posted on Google, 17 August 2026. Model: Thumb Turn (Matter). Samir, Google reviewer.
★★★★★
This is a great little device, very easy to fit, got it up and running within 5 mins. Not a bad price to pay considering the peace of mind it brings. Now I know when my family leaves the house or returns, that if they have locked the door behind them or not.
Posted on Google, 16 August 2026. Model: Thumb Turn (Matter). Raj, Google reviewer.
★★★★★
Used to drive my husband mad going back to check the door, sometimes twice over. Bought one of these and that has stopped completely. Quick look at the phone and I know where I am. Very pleased.
Posted on Trustpilot, 14 August 2026. Model: Thumb Turn (Matter). Not marked as verified by Trustpilot.
★★★★★
Incredible Invention
This is an absolute brilliant innovative idea! The worry of the unlocked door is continuous, with the help of locksure my mind is at ease! 100% recommend :)
Posted on Trustpilot, 14 August 2026. Model: Thumb Turn (Matter). Not marked as verified by Trustpilot.
★★★★★
Gives reassurance that you locked the door
This monitor works well and the video manual is easy to follow ( except for the black background on the videos that makes some details not easy to see). Once fitted, it accurately shows when the lock is locked or unlocked. It seems that this is the only solution to monitoring whether you locked the door or not. There are smart locks out there but they are all at least 4 times the cost of this monitor and I am not sure how secure the smart locks are against hacking etc. This Locksure monitor allows the well tried security of a mechanical lock but also adds the peace of mind of being able to check whether you locked it or not.
Posted on Amazon, 27 April 2026. Model: Thumb Turn (original). Verified Purchase on Amazon.
★★★★★
Highly recommend
What a great product! It’s easy to set up and install. The quality is high and it functions exactly like it says. Several times it’s helped to remind the family that the door isnt locked. Highly recommend 👍
Posted on Amazon, 8 December 2025. Model: Key Turn (original). Verified Purchase on Amazon.
★★★★★
Easy to install - No damage to latch/door - Good for elderly care
I got this as I wanted confidence that my parents were locking the door each night and without feeling like they were too intruded upon. They were really happy with this and gave both them and me confidence that the house was secure. I can think of a number of different applications but for me it was perfect to ensure that my parents were secure at home.
Posted on Amazon, 17 August 2025. Model: Thumb Turn (original). Amazon Vine reviewer, product received free.
★★★★★
Easy install and setup
Very easy to set up and install too. Super simple in fact. Well packaged and everything is clearly labelled. Works well. Seems like overkill but if you require such a device (I don’t so it’s more of a gimmick for me) then this is certainly a good place to look. Well made, wonderfully packaged and the company seems to offer good after sales support too. Would recommend.
Posted on Amazon, 26 May 2025. Model: Thumb Turn (original). Amazon Vine reviewer, product received free.
★★★★★
Exactly what I needed — smart alerts without replacing my lock.
I rent a flat and can’t change the lock, so this was the perfect solution. It sits neatly over the existing key turn and connects easily to the hub. I love that I can see if the door is locked from anywhere using the app. No security risks like remote unlocking – just simple status updates. A great smart home addition that doesn’t mess with your actual door hardware. Would definitely recommend to anyone with kids or elderly relatives.
Posted on Amazon, 24 May 2025. Model: Key Turn (original). Verified Purchase on Amazon.
The visual flash of the LEDs alone when I lock the door really stick in my memory. Locksure has been on my door for over six months now and I want to keep it!
Early adopter review from Jason, Stevenage. Date not recorded. Model: Original Locksure.
We have a three story house and, just before bed, I get paranoid if I remembered to lock the door and end up going all the way downstairs to check. No more with Locksure, I just check the app and have peace of mind.
Early adopter review from Belinda, Slough. Date not recorded. Model: Original Locksure.
I was skeptical at first because I don't have the problem of forgetting to lock my doors. Well I didn't think I did until I realised how long the door is left open by my kids! The history feature really help me get to the truth of when the kids came in and out of the house, even when I am in the office!
Early adopter review from Angela, Hartford. Date not recorded. Model: Original Locksure.
