One year and three months (since the date of manufacture).
For Sample motor, If it's destructive test/abusing usage due to test purpose, we could not do after sale issue for free.
If there is some damage during your test, which we could repair.
After checking your video or pictures, we could deliver some motor parts (e.g. hall sensor) for maintenance.
Also, you could deliver them back to our factory(We're afraid that you have to bear delivery fee, both way).
We will make maintenance as possible as we could. For repair fee, we could bear the cost for 1 year.