Smart security for added protection.

Keeping you in control at all times.

Added peace of mind for you and your bike.

AlterLock evolved

AlterLock has evolved even further.
We’ve retained the concept of movement detection alarms and tracking features, while enhancing transmission area, device tracking performance, durability, and uptime. With riders and cyclists in mind, we’ve modernized the functionality everyway conceivable.
The advanced AlterLock Gen3 system bolsters sense of security and amplifies the joy of riding to a new level.

Motion detection alarm for peace of mind

Although taking extra precaution is highly recommended, we have received many reports of cases where the alarm went off causing the perpetrator to fleeing the scene.
In most cases, it is important to prevent theft before it happens.

Evolved transmission performance

When the device detects movement, the device will send out a signal (by Bluetooth for close range and LTE-M / NB-IoT transmission over long distances) to notify the user of the anomaly via a unique notification tone from the app.

Compared to previous model, AlterLock Gen3 boasts significantly improved transmission performance and reception capability in a wide range of areas globally.

Improved tracking performance

In the unlikely event that your bike is stolen, AlterLock can track it using GNSS (GPS & Galileo), Wi-Fi and 4G base station signals to attempt to locate the final location both indoors and outdoors.
AlterLock Gen3 has improved the algorithm for acquiring location information to shorten positioning time and improve accuracy. This new system is the first of its kind in the world.

Unlike loss prevention devices like Bluetooth tracker, AlterLock independently tracks its location location.

Small and lightweight

The device weight is about 50g, which is comparable to a small cycle computer. Since it is sandwiched between the bottle cage and the bike frame, aero performance is not largely affected.

Water and dust resistance

The waterproof and dustproof performance is IP66 which means there is no problem even if you wash your bike while the device is attached to your bike. The housing structure has been greatly improved to enhance waterproof performance and durability for Gen3.

Long run time

By reducing power consumption through advanced programming, Gen3 achieves up to 3 months of run time, which is approximately twice as long as the previous Gen2 model. The charging port uses USB Type-C.

Media Coverage

Easy Installation

Purchase AlterLock device
Install the AlterLock app
Register your bike information and device in the app
Subscribe to service (in-app purchase)

30-day free trial

A free period of up to 30 days is applies to the initial service contract.
You can cancel at any time, including during the free period.


Product name / Model numberAlterLock Gen3 / AL03GB
Dimensions of main unit / WeightLength: 167mm Width: 28mm Thickness: 9mm / 53g *1
BatteryLithium polymer / Up to 3 months runtime *2
Charging portUSB Type-C *3
Operating / Charging temperature-20 – 60°C / 0 – 45°C
Transmission systemShort range: Bluetooth, Long range: LTE-M / NB-IoT *4
Positioning systemGNSS (GPS / Galileo), Wi-Fi, 4G base stations
Sensor3-axis accelerometer
AlarmMaximum 95dB *5
Water and dust resistanceIP66
AccessorySecurity bolt, installation tool, sticker

*1 Includes security bolts.
*2 Varies depending on usage conditions.
*3 Charging cable is not included.
*4 The long-range transmission method automatically changes depending on the region used.
*5 Measured at a distance of 10 cm from the product.

About the AlterLock App

Compatible with smartphones running Android 8.0 or higher or iOS 15 or higher

Service agreement

A service contract is required to use the data transmission and other functions of the AlterLock Gen3 device.

Notification of Bluetooth out of range, location tracking
Obtaining location information through periodic transmission
Crash detection and SMS notification to emergency contacts
Manage up to 3 devices with one service account with no additional charge

AlterLock Gen3 is available in the following countries

Japan, Australia, Belgium, Croatia, Czech Republic, Denmark, Estonia, Finland, France, Germany, Latvia, Luxembourg, Netherlands, Norway, Romania, Slovak Republic, Slovenia, Spain, Sweden, United States

*In the UK, Ireland, Italy and Canada, due to connectivity issues with communication providers, the device has been temporarily removed from the communication area.