3D Touch is one of the flagship features of the iPhone 6s and iPhone 6s Plus. For those who may not have upgraded to the latest devices yet, 3D Touch builds on the foundation laid within Force Touch, the pressure-sensitive feature of the iPhone. The capacitive sensors in the backlight of the Retina HD display of the phone measure the distance between the cover glass and backlight to assess how much pressure users put on the screen. Combine this with the Taptic Engine that powers Force Touch, and you get instant feedback (e.g. the screen blurring depending on how hard you press).
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