piezos on the back of touch modules,
cuts on rail that allow fr4 bends.
touch - squish
titanium is cold and walnut is warm.

触摸板背后安了压电片,
盒子上面挖槽所以电路板有空间弯曲。
触摸——挤压
钛很凉,胡桃木有体温。

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