# Classic Alarms Devices Bandwidth Usage

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This article is a guide for classic Alarms. Refer to this [article](https://app.gitbook.com/s/NU1He6Uj2tgInV2VdCLQ/reports-and-monitoring/alarms-devices-bandwidth-usage) 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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## BC51 (Alarms console)

While watching live-view:

* 5-minute input rate 0.9 Mbps
* 5-minute output rate 0.3 Mbps

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**As of August 2023,** Verkada has replaced the BC51 Alarm Console with the [BC82 Alarm Console](https://www.verkada.com/alarms/console/). For details, see the [End-of-Sale announcement](https://app.gitbook.com/s/NRq5qDDjsYNxwNzF1bcB/need-help/end-of-sale-products-policy-overview/end-of-sale-announcement-for-bc51).
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## BC82(Alarms console)

While watching live-view:

* 5-minute input rate 0.1 Mbps
* 5-minute output rate 1.2 Mbps

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The BC51 and the BC82 use WebRTC for real-time video/audio streaming. This means that the input and output rates can be higher or lower depending on available bandwidth and if you are actively watching the live stream.
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## BK21/BK11 (Alarms console)

* 5-minute input rate 0.1 Mbps
* 5-minute output rate .1 Mbps

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The BK21 and BK11 use WebRTC for real-time audio streaming. This means the input and output rates can be higher or lower depending on available bandwidth and if you are actively calling the console.
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## BH61 (wireless hub) and BP41 (Alarms panel)

* 5-minute input rate 20 kbps
* 5-minute output rate 20 kbps

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These numbers may be higher or lower depending on how many sensors are connected to a given hub and how many events these sensors generate.
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