15 things you need to know about the new iPhone 6S

Apple's iPhone 6S looks a lot like its predecessor, with the same 4.7-inch display and starting price tag of $649 (or £540 and AU$1,079) off contract.

But as with any "S" iPhone model, you do get some significant  enhancements. Click on for the design and feature highlights of Apple's new flagship phone.

Though it's not exactly the same size, the device feels nearly identical to its predecessor, the iPhone 6. It has a 750p resolution and 326ppi.

The phone measures 5.44 by 2.64 by 0.28 inches (138.3x67.1x 7.1mm) and weighs 5.04 ounces (143g).

It's slightly larger than the iPhone 6 and weighs 11 percent more overall.

Powering the device is a a proprietary 64-bit A9 chip processor that Apple says offers 70 percent computing performance (CPU) and 90 percent faster graphics performance (GPU).

The iPhone 6S comes in four colors, including the new rose gold.

The iPhone 6S has a new aerospace-grade aluminum chassis that will hopefully avoid the "Bendgate" issue from last year. It also has a chemically strengthened glass display to-boot.

Like the model before, there's a fingerprint scanner built into its home button.

Apple says, "The improved Touch ID sensor detects your fingerprint even faster than the previous generation."

How much faster, you ask? We don't know and Apple is mum on the details.

Apple has equipped the iPhone 6S with a 1,715mAh battery -- a lower capacity than the 1,810mAh version found on last year's iPhone 6. (The "mAh" acronym stands for milliampere-hour, which is a measurement of a battery's power capacity; the higher the number, the better.)

However, Apple says the battery life for the iPhone 6S is identical to the iPhone 6's.

The handset runs Apple's iOS 9 mobile operating system, which includes the mobile payment system Apple Pay and the digital search and voice assistant Siri.

Apple's voice assistant will always be on and you can summon it with a simple phrase. When you say "Hey Siri", the feature will pop-up, just like it does when you hold down the home button.

A new feature is 3D Touch, which works in conjunction with the pressure-sensitive display. Depending on how hard you press on the glass, you can interact with apps in different ways.

Apple has bumped up the phone's camera specs from eight to 12 megapixels. Users can also shoot ultra high-def (4K) video.

A camera feature called Live Photos lets you take animated pictures, allowing objects or people to move for a few seconds within the frame.

Selfie addicts and video chatters can rejoice in the fact that the iPhone 6S has a higher resolution 5-megapixel front-facing camera.

The iPhone 6S is equipped with LTE Advanced, which offers higher data rates than standard LTE, and supports up to 23 LTE bands (Apple says the most in any smartphone) for better worldwide roaming. Apple also says that the iPhone 6s is up to twice as fast when you’re connected to WiFi.

The iPhone 6S is available for pre-order now and will launch in retail stores beginning September 25. For more on Apple's recently announced products, check out our coverage here.