# Simulcast on low bandwidth device (upload)

**URL:** <https://mediasoup.discourse.group/t/simulcast-on-low-bandwidth-device-upload/4121>\
**Category:** mediasoup libraries\
**Created:** [April 22, 2022, 5:37pm UTC](https://mediasoup.discourse.group/t/simulcast-on-low-bandwidth-device-upload/4121 "2022-04-22T17:37:22Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![ksarpotdar](https://avatars.discourse-cdn.com/v4/letter/k/50afbb/32.png) [@ksarpotdar](https://mediasoup.discourse.group/u/ksarpotdar)\
**Post date:** [April 22, 2022, 5:37pm UTC](https://mediasoup.discourse.group/t/simulcast-on-low-bandwidth-device-upload/4121/1 "2022-04-22T17:37:22Z")

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Hi

How does the simulcast work in case the device has very low bandwidth (for e.g. 3g or 4g speed mobile) and may not be able to send produced videos of multiple qualities. Does the SFU or the client sense it and change it dynamically?

Or do we get any event on low bandwidth so that we can switch to the single low bandwidth tracks?