All you have to do is look at pictures:
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how to keep food hot on the plate
How to keep food warm?
Just preheat a HotSmart Plate for one minute; it gets very hot. Handle it safely by the rim with the bare hands and serve the food hot as usual.
The plate will remain hot after 30+ mins to keep your food at a nice temperature.
This is what a heat retentive plate or keep warm plate does: Stores energy very fast and releases slowly as heat.
Other are already copying this invention. Make sure you get an original patented HotSmart® http://bit.ly/hotsmart
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