In order to keep the device in the best condition for prolonged use we recommend to replace the parts every once in a while-
Injection Head: 350,000 injections
Injector: 350,000 injections or 2 months
Needle: can be configured in the Mobile Apps settings.
The default is 1,000 injection
Safety covers: 100,000 injections
You can read more here to learn how to reset the counters.