"ABS case". that means ABS plastic (Acrylonitrile Butadiene Styrene) so you end up with a plastic square. I used a good quality square to test the squareness of this device. At room temperature it was fine. Later, after the area was under direct sunlight for some time, it was no longer square. In another opinion, the description should be "plastic case" or "ABS plastic case" because "ABS case is not very simple.
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