AlterLock Gen2


AlterLock is an alarm/GPS tracking security device for bikes. It lets you keep a remote eye on your bike and notifies you on your phone when the device detects movement while the bike is locked away.

For more information about this product, please check here.


Size: 159×38×9mm
Weight: 50 g
Battery type: Lithium polymer
Battery life: up to 1.5 months/charge *1
Charging Socket: USB Type-C *2
Operating Temperature: -20 to 60°C
Charging Temperature: 0 to 45°C
Communication: Bluetooth Low Energy / Sigfox
Tracking: GPS (GNSS) / Wi-Fi
Protection: Water/Dustproofing IP66
*1 Varies according to use
*2 Charging cable is NOT included


Can AlterLock be installed on any bicycle?

AlterLock fits neatly on bottle cage bosses of most sports bikes and can be mounted underneath a bottle cage.

Is AlterLock easily removed from a bike?

When in lock mode, removing motion will be detected on the device and will trigger the alarm to notify on your phone. This will make removing the device very challenging. We also sell anti-theft bolts separately to make extra sure that the device will not be removed.

What is the difference between a Bluetooth tracker and AlterLock?

Bluetooth-based trackers are primarily intended to prevent the loss of portable items. They transmit location information when a smartphone is in the vicinity, but are not suitable for tracking moving bicycles.
AlterLock has a stand-alone communication function and supports GPS / Wi-Fi positioning, allowing you to track wherever you go.

Can AlterLock constantly receive GPS data to track?

Typical Bluetooth-based trackers can only communicate within the range of a Bluetooth connection, making it difficult to track them once they leave out of your hand. However, AlterLock uses GPS and Wi-Fi positioning, so it can be tracked anywhere.

Can the alarm sound and motion detection sensitivity be adjusted?

The frequency and duration of the alarm and the motion detection sensitivity can be adjusted using the AlterLock App.

Communication Areas

To see if the area you are trying to use AlterLock is within the range of Sigfox, please visit this page.
The European version is available in the following countries:
Austria, Belgium, Croatia, Denmark, Estonia, Finland, France, Germany, Greece, Ireland, Italy, Latvia, Lithuania, Luxembourg, Netherlands, Poland, Portugal, Slovakia, Spain, Ukraine and United Kingdom.

Weight N/A
Dimensions N/A
Mounting bolt type

Anti-theft bolts, Standard bolts

Customer Reviews

Based on 137 reviews
Gary Ravenscroft
Alterlock success

Had my LaPierre bike stolen after thieves used a grinder to cut the security. But by coordinating with the local police using the Alterlock positioning the bike was sucessfully recovered. Would highly recommend.

I have a sense of security.

Setup was easy.
The use of AlterLock in addition to the keylock gives me peace of mind.
The volume could be louder.

浩至 内海
I have the greatest sense of security wearing it.

It would let me know if there is something unusual even if I am out of sight... I think this alone is worth installing. I have installed it in both of the cars I own.
But don't be overconfident, do daily test runs, etc. to check whether the alarm goes off normally? Do you receive notifications on your phone? If the system does not notify you of an abnormality, you should check the status of the system.
I had a problem before where no notifications were sent out, and when I contacted support, they kindly told me how to deal with the problem, which was a relief, but I feel that checks should be carried out to avoid missing something that is not working...

Generally satisfied, but...

I'm generally happy with it, but overall I feel like it could still be improved.
I'm hoping for more features and specs in updates and gen3.
Real-time tracking with updates every second or so.
Battery life more than doubled.
Stable Bluetooth connection range.
Connecting, unlocking and locking with Apple Watch.
Vibration + alarm function at 5m of positional movement.
Other functional improvements are expected.
The last major system of vibration detection has a lot of false positives, and I feel it would be easier to use if a system that recognises by GPS position movement could also be added as a mode.

Thank you for your contribution regarding specific suggestions for improvement!
We will make use of them in future product development.
As for the false positives, we have further improved them in the recent firmware, and we would appreciate it if you could try it out.

Occasional connection difficulties

It's a lot more stable, but sometimes I get a bad connection. It can be fixed by restarting the device, so it's okay.

AlterLock Gen2