In the countdown for the much-anticipated Apple event on Tuesday, the tech world is now in overdrive mode for the launch of two upcoming iPhone models - the premium iPhone 5S and low-cost iPhone 5C. The event is set to kick-off at 10:00 AM PT (10: 30 PM IST ) in its Cupertino Headquarters, California.

After sorting a huge data of speculations that have been piling over the last few months, we now present a list of key specifications which are most likely to be featured in Apple's soon-to-be-launched iPhones.

Apple iPhone 5S Expected Features:

Display and Design:

From what we have heard, the next generation iPhone 5S is certain to retain its 4.0-inch size and metallic finish contour design as seen in its predecessor. However, it is reported to come with two additional features on the outside - a fingerprint sensor on its home button and a dual-LED flash beside the camera on the back side.  

Processor, OS, Storage & RAM:

The metal-clad phone will reportedly pack a new generation Apple A7 (probably quad-core) processor complimented by 2GB RAM for smooth operation under the new iOS v7.0. Apart from new operating system, Apple fans can expect to experience a new way of unlocking their iPhone screen via the fingerprint sensor on the home button. In terms of memory, one can expect the iPhone 5S to come in four variants - 16GB, 32GB, 64GB and 128GB. [To know the key features of new iOS v7.0, click here]

Camera:

Rumours are rife that iPhone 5S is most likely house a 13.0-megapixel camera on the rear side with dual-LED flash for taking good quality pictures under low-light conditions. Even though there is no clue regarding the pixel count of iPhone 5S' front camera, we expect the high-end phone to have the ability to record at least HD 720p video.

Apple iPhone 5C Expected Features:

Even though Apple is tight-lipped about the budget iPhone, the press invites sent hint that iPhone 5C with multiple colour variants is most likely to make its debut at the Apple event. The invites read - "This should brighten everyone's day".

Display and Design:

The low-cost Apple phone is expected to measure 4.0-inch in size and come with 1136x640p resolution display supported by a plastic shell made out of tough polycarbonate material.

Processor OS, RAM and Storage:

Apple, in order to keep the cost down, is also said to have kept the old-generation dual-core Apple A5 chipset with 1GB RAM, enough to operate most apps and games flawlessly under new iOS v7.0. Storage wise, the iPhone 5C is expected to sell in three variants - 16GB, 32GB and 64GB.

Camera:

iPhone 5C is expected to flaunt an 8.0-megapixel camera on the rear side and 1.2-megapixel camera on the front side.

Release date and expected price of Apple iPhone 5S and iPhone 5C:

As per recent reports, after the 10 September unveiling, Apple is expected to begin sales of the new phones in the US and select markets in the third week of this month, most probably by 20 September.

Apple is also reported to hold a formal event in China on 11 September to unveil the low-cost iPhone 5C, and is said to begin sales on 20 September as well.

The company is said to have signed a new agreement with the country's biggest carrier, China Mobile, to sell its device. It is expected to attract more than 744 million China Mobile subscribers.

Considering Apple's recent success in iPhone sales in India, the company may plan to release new smartphones in the subcontinent soon.

iPhone 5S is expected to sell in three colour variants - white, black (Graphite Grey) and champagne old, with prices beginning from $650(approximately ₹41,000) without contract, whereas iPhone 5C is said to sell in five colour variants - white, yellow, blue, red and green with prices beginning from $400(around 25,700) without contract.

Rumoured specifications of Apple's premium iPhone 5S and Low-cost 'iPhone 5C':

Model

Apple iPhone 5S

Apple iPhone 5C

Display

4.0-inch screen with IGZO display technology

4.0-inch screen with 1136x640p display resolutions

OS

iOS 7

iOS 7

Processor

Next generation quad-core Apple A7 processor

Dual-core Apple A5 processor

RAM

2GB LPDDR3 RAM

1GB

Storage

16GB/32GB/64GB/128 GB

16GB/32GB/64GB

Camera

13.0-megapixel camera with Dual-LED flash support for enhanced low-light image capture

Main: 8.0-megapixel camera

Front:1.2-megapixel camera

Add-ons

Finger-print scanning system to unlock screen, improved voice-search feature Siri, NFC

Plastic shell with multiple colour options, 3.5 mm audio port, lightning port

Colour options

Champagne Gold, Black(Graphite Grey) and White

Expected to come in Black, White, Blue, Red, Yellow and Green