# - [firebase](https://firebase.google.com/docs/reference/js/v8/firebase).
- [auth](https://firebase.google.com/docs/reference/js/v8/firebase.auth).
- PhoneMultiFactorAssertion

The class for asserting ownership of a phone second factor.

## Index

### Constructors

- [constructor](https://firebase.google.com/docs/reference/js/v8/firebase.auth.PhoneMultiFactorAssertion#constructor)

### Properties

- [factorId](https://firebase.google.com/docs/reference/js/v8/firebase.auth.PhoneMultiFactorAssertion#factorid)

## Constructors

### Private constructor

- new PhoneMultiFactorAssertion ( ) : [PhoneMultiFactorAssertion](https://firebase.google.com/docs/reference/js/v8/firebase.auth.PhoneMultiFactorAssertion)
-

  #### Returns [PhoneMultiFactorAssertion](https://firebase.google.com/docs/reference/js/v8/firebase.auth.PhoneMultiFactorAssertion)

## Properties

### factorId

factorId: string Inherited from [MultiFactorAssertion](https://firebase.google.com/docs/reference/js/v8/firebase.auth.MultiFactorAssertion).[factorId](https://firebase.google.com/docs/reference/js/v8/firebase.auth.MultiFactorAssertion#factorid)
The identifier of the second factor.