Force touch may be a feature exclusive to the latest iPhones, but something like it is now possible on pretty much any phone out there, thanks to research from engineers at the University of Michigan.

It works not by polling sensors in the touchscreen, but through ultrasound.

The phone s speaker emits a sound covering the 18-24 kHz range, well outside what a human can hear — but the device s microphone can detect it just fine.

Touches with different pressures don t register on the gyro or accelerometer, but are clear as day to the ForceTouch process.

It s not quite the level of detail you get with the sensors in an iPhone 6s, to say nothing of those in, say, a Wacom tablet, but it seems like enough that you could rely on it as a gesture.

You might remember in The Dark Knight when Batman turns all the phones in the city into sonic locators in order to find the Joker.

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