The device counts the number of injections performed per needle and gives the operator an alert when the needle should be replaced.
You can configure the number of injections you want per needle in the Mobile App's settings.

2. Click on Settings.

3. Find the "Injections until needle switch" field and insert the number of injection you wish to apply until switching the needle.

4. Click the "Save" button.

5. Wait for the two check marks beside each device to be sure the information is synchronized to the Control units.

Now, when you get to the number of injections you set per needle you will receive a Replace Needle Notification.