1 year from the date of purchase.
And in case user accidentally breaks or damages the handset they will surely get a new handset.
Also this seems to be a marketing gimmicks for the sale of HTC One M9.
source: www.techworm.net
HTC introduces “UH OH” program to replace damaged HTC One M9 for free within a year of purchase
HTC's UH OH Protection for its new release HTC One M9 is a sort of insurance cover, purchaser will get a new one absolutely free in return for damaged phone
