How do I pair this Tuna Zigbee LED controller

I bought one of these as an experiment.
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It came with no instructions other than saying download their app. However, the app is obviously for BTLE devices, not Zigbee and I can find nothing on how to pair these to my existing Zigbee controller.

According to aliexpress, assuming it’s the same device (you gave zero reference):

Cheers. I’ll give it a go and report back