Fire King Pizza Box, by Comfort Products.
Suitable for use on gas BBQs and charcoal BBQs.
The instruction leaflet isn't in English, but is included. Not been able to find any instructions for this particular model, but have found a video for how to use something very similar.
The oven comes with a pizza "stone" and an handle, for safely removing the stone from the oven. The oven itself has a thermometer on the top.
Obviously care must taken when using this product, to not burn oneself.
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