Warranty/Guarantee: A) How long—? We provide atomizer 3 months guarantee, battery and other parts 6 months guarantee from the ship date. (Vandalism can not be guaranteed) B) How to—? Usually we ship to replacement to you with your next order if you can provide the proof(photo or video) of the broken parts, if the quantity exceed 20% of your order quantity, we will request you to send back the broken parts to us to check and analyze the reasons.(this situation almost not exist.)