I got this just to see what the safety features were like. There seems to have been a spate of mini heaters being sold that either plug directly into a socket or are designed to be placed on a desk for low level local heating.
Most of the lower power ones seem to use PTC based heaters that self regulate around a small temperature range by increasing their resistance as they get hotter. I wondered what other thermal protection was present inside.

The unit seems to house a very standard looking heater module. It's quite neat that they've fitted it all into an optimal space. The replacement label on the box was wrong. The original data it was covering was correct for power and dimensions.

The fan isn't quite as quiet as the camera makes it seem. There seems to be noise gate that masks lower level noise.

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