Samsung Galaxy S4 (16GB) [Grade B]

The Samsung Galaxy S4 is an Android smartphone produced by Samsung Electronics as the fourth smartphone of the Samsung Galaxy S series and was first shown publicly on March 14, 2013, at Samsung Mobile Unpacked in New York City. It is the successor to the Galaxy S III, which maintains a similar design. Still, with upgraded hardware, more sensors, and an increased focus on software features that take advantage of its hardware capabilities—such as the ability to detect when a finger is hovered over the screen, and expanded eye tracking functionality, it was released the previous year. The Galaxy S4 is among the earliest phones to feature a 1080p Full HD display, 1080p front camera video recording, and among few to feature temperature and humidity sensors and a touch screen able to detect a floating finger.

Camera

The camera of the Galaxy S4 uses a 13-megapixel Sony Exmor RS IMX135 image sensor(4128×3096). The front camera of the Galaxy S4 allows 1080p Full HD video recording for the first time in any Samsung mobile phone. The image sensor of the front camera is a Samsung CMOS S5K6B2

Sensors

The S4 is equipped with an accelerometer sensor, a gyroscope, a front-facing proximity sensor, a digital compass and a barometer. The S4 is also equipped with a hall sensor for the S View cover, a self-capacitive touch screen layer for Air View and thermometer and hygrometer sensors.

Interaction

The Galaxy S4 is known for introducing a range of extended interaction features to the Samsung Galaxy S series. Head tracking features have been extended on the S4, summarized as "Samsung SmartScreen". The new "Smart Scroll" feature can be used to scroll while looking at the screen by slightly tilting the head or phone forward or backward, and "Smart Pause" allows the video player to pause videos if the user is not looking at the screen. "Smart Rotation" tracks the facial orientation using the front camera to match the screen rotation and "Smart Stay" prevents entering stand-by mode by deactivating display time-out while the user is looking at it.