# Set Up Universal Transmitter Mode on a BR31

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This article is a guide for classic Alarms. Refer to this [article](https://app.gitbook.com/s/NU1He6Uj2tgInV2VdCLQ/installation/set-up-universal-transmitter-mode-on-a-br31) if you have new Alarms. See [New Alarms vs Classic Alarms](https://app.gitbook.com/s/NU1He6Uj2tgInV2VdCLQ/getting-started/new-alarms-vs-classic-alarms) if you are unsure which version of Alarms you have.
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The [Verkada BR31 wireless door sensor](https://docs.verkada.com/docs/br31-quick-start-guide.pdf) can be used as a universal transmitter, enabling wired alarm devices to communicate wirelessly with Verkada wireless hubs.

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**Collect the required components, including the main body of the BR31, a T10 Torx screwdriver, and the wired sensor.**

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**Use the T10 Torx screwdriver to unscrew the Torx screw on the underside of the BR31. Remove the backplate of the unit.**

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**Plug the leads of the wired alarm sensor into the 2 inputs at the top of the BR31 unit. Polarity does not matter in this case.**

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## Command set up

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[Add the device](https://app.gitbook.com/s/NRq5qDDjsYNxwNzF1bcB/organization-settings/add-a-device-to-your-command-organization) to Command before you continue.
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**Navigate to the Devices page in the alarm site.**

a. At the top right, click the **ellipsis** icon.\
b. Click **Edit Sensor**.

<div align="left" data-with-frame="true"><img src="https://2326462210-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F9tIFgMOGbY4p9wWaKQhl%2Fuploads%2Fgit-blob-6119c55b12c92713a4743726b6d603124a9cea9e%2F9253f4f4eaae2a301b66dde7bd2a35394c110d64.png?alt=media" alt="" width="562"></div>

​

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**In the device settings:**

a. Enable **Universal Transmitter Mode**.\
b. Select the normal state of the sensor (see specific, relevant sensor). Wired door contact sensors are commonly "Normally Closed".\
c. Click **Done** and wait a few minutes for the new configuration to update on the BR31.

<div align="left" data-with-frame="true"><img src="https://2326462210-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F9tIFgMOGbY4p9wWaKQhl%2Fuploads%2Fgit-blob-f3611e72a0b3ea23282bbbc45299d4724e94b9e8%2Fc9bbab302d6330fb03d5e0c46b426f3013bf436c.png?alt=media" alt="" width="264"></div>
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**Manually trigger the wired sensor to confirm that the BR31 is transmitting the sensor events to Command.**

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**Once device performance is confirmed, follow the mounting steps in the** [**BR31 Install Guide**](https://docs.verkada.com/docs/br31-quick-start-guide.pdf) **to complete the installation.**
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