4th Generation: This model gained the high-resolution Retina Display screen, two cameras including one that records video at 720p HD, and support for FaceTime.

Available in 16GB, 32GB, and 64GB models. It includes a 4-inch screen, the speedy A5 processor, support for Siri, and is very light and thin. 5th Generation: This model of the Touch is very similar to the iPhone 5.6th Generation: This model brings many of the hardware features of the iPhone 6 series - the A8 processor and M8 motion coprocessor, an 8-megapixel camera, 128 GB storage capacity - to the touch lineup while maintaining the same size and weight.It's similar to the iPhone 7 series thanks to its Apple A10 Fusion processor and up to 256 GB of storage. 7th Generation: This model was the first update to the Touch in almost four years.This feature is most often used in games and gives players more immersive and interesting ways to control onscreen action. Accelerometer: A sensor that allows the Touch to respond to how the device is held and moved.models use the smaller Lightning connector, while all earlier models used the older, bigger 30-pin version.

Dock Connector: This slot on the bottom of the Touch is used to sync content between a computer and the device, and to connect some accessories.

Camera: The 6th generation touch sports two cameras, a higher resolution unit on the back for photography and a lower-resolution, user-facing camera for FaceTime video chats and selfies.

model includes support for both the 2.5 GHz and 5 GHz Wi-Fi bands and adds support for 802.11a/n/ac.

Wi-Fi: The Touch accesses the Internet via Wi-Fi, with all later models using 802.11b/g standards.

Volume control: On the left side of the Touch is a button that can be pressed in two directions, one each to raise or lower the volume.

Hold button: This button on the top right corner of the Touch locks the screen and puts the device to sleep.

Home button: The button on the bottom center of the face of the iPod Touch is used in many functions, including quitting programs and multitasking.The Retina Display screen was introduced with the 4th gen.

The 4th generation touch and earlier used a 3.5-inch screen.

Screen: The 4-inch high-resolution, multi-touch, Retina Display screen is the same as the one used in the iPhone 5 and includes the same features, like zooming in and out by pinching.

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