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[Home](./index.md) > [@firebase/auth](./auth.md) > [FactorId](./auth.factorid.md)
## FactorId enum
An enum of factors that may be used for multifactor authentication.
<b>Signature:</b>
```typescript
export declare const enum FactorId
```
## Enumeration Members
| Member | Value | Description |
| --- | --- | --- |
| PHONE | <code>"phone"</code> | Phone as second factor |