What is covered under the Vaporesso Xros 4 Nano warranty, and how long does it last?

Vaporesso offers a limited 90-day warranty from the date of purchase, and you will need to keep valid proof of purchase such as invoices or receipts to make a claim. The warranty does not cover damage caused by misuse, human damage, cracked or modified hardware, or opened and used consumable items such as coils, cartridges, and e-liquids. (Page 68)