> For the complete documentation index, see [llms.txt](https://whitepaper.sonorus.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://whitepaper.sonorus.network/key-nft-elements-of-sonorus-protocol/record-player-nft.md).

# Record Player NFT

### What is Record Player?

A Record Player in Sonorus is an NFT that allows users to host their records and earn rewards. Users have to hold at least one record players to start earning.

### Where to get a Record Player?

There are three ways for users to obtain a new record player:

* Users can use their $RUS to generate new record players through **build**
* Users can **purchase** record players from Sonorus' in-app marketplace (currently under development)
* Users can generate new record players from old ones using $RUS through **forge** (currently under development)

### Record Player Attributes

#### **Levels**

**The levels of Record Player NFTs decide the number of music copies each Record Player NFT can host.** In general, the higher the level of a Record Player, the more music copies it can host.

**Record Player UpgradesUsers can upgrade their Record Player NFTs with $RUS tokens to achieve higher levels.** The following table lists the current amount of $RUS tokens required to upgrade at each level. Please note that upgrade costs are subject to periodic adjustments to maintain sustainability of Sonorus tokenomics.

| **Record Player Level** | **Copy Capacity** | **Upgrade Cost** |
| ----------------------- | ----------------- | ---------------- |
| Level 1                 | 10                | 700 RUS          |
| Level 2                 | 50                | 1500 RUS         |
| Level 3                 | 100               | 7500 RUS         |
| Level 4                 | 500               | 14000 RUS        |
| Level 5                 | 1000              | 25000 RUS        |
| Level 6                 | 2000              | <p><br></p>      |

#### **Battery Life**

**Users can only earn $RUS yield if their record players has battery remaining.** When a record player runs out of battery, it is deemed inactive. Users can still listen to their purchased tracks, but they will not be eligible for any Sonorus rewards mechanisms.

**Each record player has a battery life of 7 days**. The battery life only decreases when the record player is in use.

**Users can recharge their record players using their $RUS tokens.** Every time a Record Player is recharged, the battery of the Record Player is restored to full. As listed in the table below, the higher the level of a Record Player, the more $RUS tokens it needs to recharge its battery. Please note that recharge costs are also subject to periodic adjustments to maintain sustainability of Sonorus tokenomics.

| Record Player Level | Recharge Cost |
| ------------------- | ------------- |
| Level 1             | 105 RUS       |
| Level 2             | 525 RUS       |
| Level 3             | 1050 RUS      |
| Level 4             | 5250 RUS      |
| Level 5             | 10500 RUS     |
| Level 6             | 21000 RUS     |

The unit of the active period is a "day," which equals 24 hours. For example, if a user recharges their record player at 1 pm today, the record player will become inactive at 1 pm seven days later. Each time a user recharges their record player, the active period will reset, and the remaining active period will be lost. For instance, if a user recharges their record player at 1 pm on day 1 and recharges it again at 10 am on day 7, the new expiration time will be 10 am on day 14, instead of 1 pm on day 15.

#### **In Use vs Available**

Every record, regardless of the number of copies a user has purchased, occupies a single record player. A record player is marked as "In Use" when a track occupies it; otherwise, it is marked as "Available." Users can insert newly purchased tracks into available record players.

For more available record players, users can choose to:

* Build, purchase, or forge new record players
* Upgrade their record players to increase the record capacity.


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