Hall Effect?

So I was once again looking through the DTEK60 specs and I noticed this one (Hall Effect) under Sensors.

Anyone know what this is supposed to be?

A Hall effect sensor is a transducer that varies its output voltage in response to a magnetic field. Hall effect sensors are used for proximity switching, positioning, speed detection, and current sensing applications.
The main function of this proximity sensor is to detect how close your smartphone's screen is to your body. When you use your smartphone, it detects the position of ear with respect to screen and turns off the light of screen and saves battery. Also proximity sensor stops the accidental touch, unwanted input during talk. This sensor also detects the signal strength, interference sources and amplify or filter by use of Beam Forming Technique. Thus, in a nutshell, proximity sensor detect the presence of body like cheek, face or ear and stops the web surfing, music or video during talk/calling and save the battery. After the conversation, it resumes the same function which was stopped earlier during talk.

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