# Limits on modem

In this case study, we will look at how to set speed and traffic limits on a modem.

To configure the modem limits, follow the steps below:

1. Get a list of your modems and select some of them. You can get a list of modems [`by host`](https://docs.proxy-seller.com/mobile-crm/usage-guides/host-actions/list-of-host-modems) or [`without host`](https://docs.proxy-seller.com/mobile-crm/usage-guides/modem-actions/get-all-modems).
2. Use the following method from our  [`Set a speed limit and traffic limit for  modems`](https://docs.proxy-seller.com/api-reference/modems#set-a-speed-limit-and-traffic-limit-for-modems)

{% hint style="danger" %}
If the modem has authorizations (users) and proxy limits are set on at least one of them, at the moment of setting limits on the modem, all limits from authorizations will be reset
{% endhint %}

Example of successful execution of a request in JSON format:

```json
{
  "failedModems": []
}
```