Samsung Galaxy S4

Samsung Electronics Co., Ltd. is a South Korean multinational electronics company headquartered in Suwon, South Korea. It is the flagship subsidiary of the Samsung Group and has been the world's largest information technology company by revenues since 2009. Samsung Electronics has assembly plants and sales networks in 88 countries and employs around 370,000 people. For 2012 the CEO is Kwon Oh-Hyun.

Samsung has long been a major manufacturer of electronic components such as lithium-ion batteries, semiconductors, chips, flash memory and hard drive devices for clients such as Apple, Sony, HTC and Nokia.

In recent years, the company has diversified into consumer electronics. It is currently one of the world's largest manufacturers of mobile phones and smartphones fueled by the popularity of its Samsung Galaxy line of devices. The company is also a major vendor of tablet computers, particularly its Android-powered Samsung Galaxy Tab collection, and is generally regarded as pioneering the tablet market through the Samsung Galaxy Note family of devices.

Samsung has been the world's largest maker of LCD panels since 2002, the world's largest television manufacturer since 2006, and world's largest manufacturer of mobile phones since 2011.Samsung Electronics displaced Apple Inc. as the world's largest technology company in 2011 and is a major part of the South Korean economy.

Samsung Galaxy S4 is an Android smartphone produced by Samsung Electronics. First unveiled on March 13, 2013 at Samsung Mobile Unpacked in New York City, it is a successor to the Galaxy S III which maintains a similar design, but with upgraded hardware 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 (which includes scrolling). A hardware variant of the S4 also became the first ever smartphone to support the emerging LTE Advanced mobile network standard.

The S4 was made available in late April 2013 on 327 carries in 155 countries. Upon its release, it became the fastest selling smartphone in Samsung's history; the company sold 20 million S4 units worldwide in the two months following the device's launch.  Samsung has since sold more than 40 million units.

In addition to the touchscreen, the S4 has several physical user inputs including a home button located near the bottom of the screen, at the bottom of the S4 is the primary microphone and the micro’s port for both data connections and charging; it also supports USB host and MHL 2.0. There are volume keys on the left side and a power/lock key on the right. At the top there is a 0.14-inch (3.6 mm) headphone jack, the secondary microphone, and infrared blaster. The backside of the S4 has the 13-megapixel camera and LED flash, and at the bottom left edge has the loudspeaker.