# Chargen NFTs NFTs will play important role in determining how much a user will earn while charging their mobiles. The earning depends on the rarity of the NFT. Users can buy and sell the NFTs in the NFT marketplace. Also, there are multiple functionalities described below. **The rarity of NFTs –** NFTs are of different rarity from common to rare and legendary. Based on level, they are divided into 5 levels, 1 being minimum and 5 being the max. Also, there is percentage associated with each NFT like battery percentage - 20%, 40%, 60%, 80%, 100%. Higher level equals higher rewards earned! **Upgrade NFT –** Holder of NFT can upgrade their NFT using the ChargeN Tokens they will earn through charging mobile. For example, you can upgrade NFT from level 1 up to level 5 using ChargeN tokens. **Trade-Up –** You can also trade up NFTs in the marketplace. This is a new feature we have added to the marketplace. You can trade up your NFTs to a higher rarity, like let's say 3 commons to 1 rare with X % chance of success. There isn´t 100% success rate that you will get the rare one, so proceed with care. All NFTs used for trade-up will be burned. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://info-chargen.gitbook.io/whitepaperv1/chargen-nfts.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.