Samsung J7 Light Sensor I got Samsung J7 but it doesn't has auto brightness feature, but in GSM Arena review said it has ambient light.... but it doesn't have auto-brightness and notification light?
can anyone tell me what is ambient light sensor?
thank you
Ambient light sensor is a hardware to measure the level of ambient light. Samsung Galaxy J7 does not have it for sure. Then J7 cannot automatic adjust the screen brightness, regarding to the ambient light level by default.

However there are apps (search in Play Store) that can make use of built-in camera to measure ambient light and enable automatic screen brightness adjustment.