It is reported by foreign media that Apple has recently successfully obtained some patents in the U.S. Patent Office, one of which is described as "multiple implementation methods and advantages of equipping the iPhone/iPad with a liquid metal home key". From the description of this patent, we know that this patent is preparing for the future iPhone/iPad.

The elasticity and plasticity of liquid metal will make it an ideal metal material for the pressure sensitive home key. The liquid metal home key can not only provide a better sense of pressing and the life of the key, but also because the liquid metal deforms when pressing the home key, thus clinging to the fingers, increasing the contact surface between the metal and fingers, which is more conducive to the fingerprint identification of the home key. When the fingers leave the liquid metal home key, The home key will return to normal.

Although it is certain that the liquid metal home key will be used for iPhone/iPad in the future, it is unlikely that we will see it on iPhone 7 from the news of iPhone 7 this year.