Samsung Phone Detecting People and Objects

In Engadget: Advanced usability via sensory detection.  " ... Samsung's Ultrasonic Cover: a specialized case that uses sound waves to detect people or objects (in a two-meter radius), helping users navigate new surroundings by sending vibration or spoken alerts. Even without the accessories, the Galaxy Advance Core features a trio of physical buttons on the front and dedicated camera and voice recorder buttons on the side, assisting smartphone owners that don't want to rely solely on on-screen controls. ... "