Looking at the spec it looks like Kitvision have done 2 models with the same model number. The older model was 4k 15fps but this new model is 30fps but its likely both are upscaled anyway.
It would be so useful if they actually told you which sensor and chipset it uses so you could have some idea of its performance. This one here for £20 does have gyro stabilisation I think and based on a Novatek chipset however I don't know how good it is. https://www.ebay.co.uk/itm/333691485627 You also get two batteries. It's likely better than the Kitvision. Seems older stock but this may not be a bad thing as action cameras seem to be increasing in price even those based on low end chipsets. It also has a genuine 2k mode at 30 fps which should be a lot more useful than its 4k at 24fps or the kitvisions 15fps. The same supplier has two other action cameras but I think the model with the built in front display is based on an inferior chipset without stabilisation.
I got one sent out to review, probably worth the money but wouldn't recommend if you want good quality
4 K (15 fps – 1080 p @ 60 fps)
My experience of two KitVision cameras tells me that this thing will be shockingly awful. If you want to spend your 18 quid on something hot, try a starbucks coffee (though you'll probably need £20).