# Set Up Universal Transmitter Mode on a BR31

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This article is a guide for new Alarms. Refer to this [article](https://app.gitbook.com/s/9tIFgMOGbY4p9wWaKQhl/installation/set-up-universal-transmitter-mode-on-a-br31-with-classic-alarms) if you have classic Alarms. See [New Alarms vs Classic Alarms](https://help.verkada.com/new-alarms/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) acts as a universal transmitter to allow wired alarm devices to connect wirelessly to Verkada hubs. This is beneficial when vertical sensor installation isn’t possible due to door framing.

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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 configuration

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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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**In Verkada Command, go to All Products > Alarms.**
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**Select your Alarms site.**
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**In the left navigation, click Devices.**
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**Click your sensor and select Device Settings > Enable Transmitter Mode.**
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Before a sensor updates its configuration, an event needs to trigger (tamper, door open/close, etc.). Press the button on the back or move a magnet near the sensor; this will prompt it to immediately retrieve the latest configuration.
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