iPod Touch

The iPod Touch (trademarked and marketed as iPod touch) is a portable media player, personal digital assistant, and Wi-Fi mobile platform designed and marketed by Apple Inc. The product was launched on September 5, 2007, at an event called The Beat Goes On. The iPod Touch adds the multi-touch graphical user interface to the iPod line. It is the first iPod with wireless access to the iTunes Store, and also has access to Apple's App Store, enabling content to be purchased and downloaded directly on the device. Apple Inc. has sold 20 million iPod Touch units as of September 2009.

The iPod Touch is currently in its third generation (3G), which is available with 8, 32 or 64 GB of flash memory. The second generation iPod Touch, featuring external volume controls, a built-in speaker, a contoured back, built-in Nike+, Bluetooth support, and the ability to connect a microphone, was unveiled on September 9, 2008, at the "Let's Rock" keynote presentation. The third generation iPod Touch with the new iPhone OS 3.1 was announced and subsequently released on September 9, 2009. The third generation includes faster hardware (the same microprocessors, graphics engine, and RAM as the iPhone 3GS), a slightly lower battery life, voice control, light sensor, and bundled earphones with a remote and microphone. The new generation and the concurrently available second generation 8 GB model are available at a new lower pricing structure.


Hardware
The iPod Touch has a slim rectangular shape with rounded edges, with a glass touchscreen display covering most of the top surface and a physical home button off the touchscreen. The display functions similarly to the multi-touch trackpad as implemented in Apple's current line of laptop computers. The touch and gesture features of the iPod Touch are based on technology originally developed by FingerWorks. On February 5, 2008, a 32 GB version was added in addition to the 8 and 16 GB models. On September 9, 2009, a 64 GB version was added and the 16 GB model was removed from the line-up.


Software
The home screen has a list of icons for the available applications. All iPod Touch models include such applications as Music, Videos, and Photos (collectively duplicating the standard functions of the iPod Classic), iTunes (providing access to the Wi-Fi Music Store), Safari, YouTube, Calendar, Contacts, Clock, Calculator, and Settings. Later models added Mail (accessing POP/IMAP/SMTP e-mail), Maps, Stocks, Notes, and Weather, which could also be added to the earlier models with the purchase of a software upgrade. The user can add direct links to Web sites, called "Web Clips", to the home screen. All iPod Touch models are equipped with Wi-Fi 802.11b/g.

On July 11, 2008, the iPhone 2.0 Software Update was released for purchase for the iPod Touch. The update allowed first generation iPod Touch devices access to the App Store to download third-party applications, in addition to a host of minor bug fixes. On June 17, 2009, the iPhone 3.0 Software Update was released for purchase for the iPod Touch. The update allowed the devices to use new apps, and unlocked the Bluetooth functionality of the second-generation iPod Touch, enabling A2DP and P2P apps.

Comparisons to the iPhone and model comparisons
The iPod Touch and the iPhone, a smartphone by Apple, share the same hardware platform and run the same iPhone OS operating system. The iPod Touch lacks some of the iPhone's features such as access to cellular networks and a built-in camera (and microphone on older models); as a result, the iPod Touch is slimmer and lighter than the iPhone. Steve Jobs once referred to the iPod Touch as "training wheels for the iPhone".

The second generation iPod Touch has an external volume switch and a built-in speaker like the iPhone. The second generation also comes with the chrome frame seen on the iPhone 3G, making the two almost identical when viewed from the front. However, there are some notable differences, as there is no speaker above the screen, no silent/ringer switch, the back is metal, and the sleep/wake button is on the other side. The second generation also supports audio input when a headphone or earphone with microphone capabilities is plugged into the audio output (headphone) jack. The iPod Touch 2.0 Software Update supports WPA2 Enterprise with 802.1X authentication. The iPhone OS 3.0 update unlocked Bluetooth capability on the second generation iPod Touch, as the included Wi-Fi chip (Broadcom BCM4325) has Bluetooth support.

Second generation iPod Touches are said to have a yellower cast/tint to the display, as compared to the iPhone or the original iPod Touch. The applications processor inside the second generation iPod Touch runs slightly faster than the processor inside the iPhone 3G, but slower than the iPhone 3GS. The first generation iPod Touch works with all "Made for iPod" peripherals, but certain changes that Apple made to the second generation iPod Touch prevent some existing peripherals from recharging the updated player. The Google Street View feature added on iPhone firmware version 2.2 is absent from the same version of firmware released on the iPod Touch but is found in the 3.0 update.

Apple has received criticism for its allegedly differential treatment of iPhone and iPod Touch owners. Such criticism is primarily targeted towards Apple charging iPod Touch owners for major software updates of the iPhone OS that iPhone owners can obtain at no charge as well as excluding certain features from the iPod Touch software that are included in the iPhone. Apple has been reported as saying that they can add features for free to the iPhone because the revenue from it is accounted for on a subscription basis under accounting rules, rather than as a one time payment.


Requirements
As supplied new, the iPod Touch needs a connection to a computer for initial configuration. Officially, Apple requires iTunes to be installed on either a Mac OS X or Windows operating system based computer for configuring the iPod Touch. On either operating system, the iPod Touch must be connected through a USB port. The first time the iPod Touch is turned on, a "connect cable to iTunes" graphic will be displayed continuously until the iPod Touch is connected to a computer running iTunes.

To use the iPod Touch for buying products at the iTunes Music Store via Wi-Fi, an iTunes Music Store account must be created and the account details then entered into the iPod.[citation needed]

Apple states that the following is required for the iPod Touch:

* A computer running either:
o Mac OS X 10.4.10 or later
o Microsoft Windows XP with SP2 or later, or Microsoft Windows Vista (32 or 64-bit
versions)
* iTunes 8.2 for iPhone OS 3.0.x or later, iTunes 8.0 for iPhone OS 2.1.x, iTunes
7.6 for iPhone OS 2.0.x or earlier
* Available USB 2.0 port


Third-party applications
The only official way to obtain third-party applications for the iPod Touch is Apple's App Store, which is a branch of iTunes Store. The App Store application, available in all versions of the iPhone OS from iPhone OS 2.0 onwards, allows users to browse and download applications from a single online repository (hosted by Apple) with the iTunes Store. To develop such software, a software development kit (SDK) was officially announced on March 6, 2008, at an Apple Town Hall meeting. The iPhone SDK allows developers to make applications for the iPhone and iPod Touch after paying a fee to join the development team. The developer can then set the price for the applications they develop and will receive 70% of money earned. The developer can also opt to release the application for free and will not pay any additional costs.

Shortly after the iPod Touch was released, hackers were able to "jailbreak" the device through a TIFF exploit. The resulting application enabled the user to download a selection of unofficial third-party programs. Some of these give the user more control over the iPod Touch than is officially available, and also make it possible to install Linux operating systems on the device. All officially released versions of the iPhone OS through 3.0 can be jailbroken, but version 3.1 could not at the time it was released. Servicing an iPod Touch after jailbreaking or other modifications made by unofficial means is not covered by Apple's warranty.

Specifications
The specifications as listed on Apple's website for the 8GB second generation iPod Touch and third generation iPod Touch are:

* Screen material: glass (arsenic
* Screen size: 3.5
* Screen resolution: 480x320 px at 163 ppi, with 3:2 aspect
* Input method: Multi-touch screen interface, Sleep/Wake button, Accelerometer, Home
button, Volume Rocker buttons (2nd/3rd Gen
* Operating system: iPhone OS (current version 3.1.2, build
* Storage: 8, 32 and 64 GB flash
* CPU: Initially ARM 400 MHz, but now 412 MHz for 1st generation, 533 MHz[1] for 2nd
Generation and ARM Cortex-A8 833 MHz underclocked to 600 MHz for 3rd
* GPU: PowerVR MBX Lite in 2nd Generation and PowerVR SGX GPU for 3rd
* RAM: 128 MB DRAM in 1st & 2nd Generation and 256 MB DRAM in 3rd
* Wi-Fi (802.11 b/
* Built-in rechargeable, non-removable lithium battery with up to 6 hours of video
playback, and up to 36 (30 in 3rd Gen and Fall 2009 2nd Gen) hours of audio
playback, times
* Built-in audio speaker (except in 1st
* 3.5 mm audio output
* Size: 110×61.8×8 mm (4.3×2.4×0.33
* Weight: 115 grams (4.1
* Direct iTunes Store
* Widescreen
* Included applications: Safari web browser, YouTube client, Mail email client,
Google
* Access to App Store (requires iPhone OS 2.0 or
* Widgets: Stocks, Weather,
* Access to Starbucks music (available only in selected cities across the United
States)

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