Samsung SGH-S730M User Manual page 26

11. Proximity Sensor detects how close an object is to the surface of
the screen. This is typically used to detect when your face is
pressed up against the screen, such as during a phone call.
–
While talking on the phone, the sensor detects talk activity and locks the
keypad to prevent accidental key presses.
12. Light Sensor lets you use the ambient light level to adjust the
screen brightness/contrast. This sensor decreases screen
brightness in dim light.
• In a bright light condition (outdoors), the sensors cause the device to
increase the brightness and contrast for better viewing.
• In dim light conditions, the device increases the screen brightness to
compensate.
13. Receiver allows you to hear the other caller and the different ring
tones or sounds offered by your phone.
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