A proximity sensor is a device that can detect the presence or absence of an object without physical contact. It uses technology like infrared or ultrasonic waves to determine if an object is near or far. Full definition
The audio unit is also equipped with proximity sensors which switches the system to operating mode once a finger comes near it. (motorbeam.com)
It is controlled by means of a high - resolution touchscreen including proximity sensor, while LED light strips provide an additional indication of the charge status. (tcbmw.com)
Move your finger over proximity sensor for 3 - 4 times and try to change the value on screen. (gogi.in)