The 2011 version of the iPod touch (4th Generation) is identical to the original iPod touch (4th Gen), with the main differences being the addition of a white color option alongside black and a lower price for the entry-level model. The black configurations even share the same order numbers as the original models.
Like its predecessor, the iPod touch (4th Gen, 2011) resembles a "phone-less" version of the iPhone 4. It lacks 3G/EDGE mobile networking, A-GPS (though it supports Wi-Fi-based location mapping), and a digital compass. It also has a lower-quality, roughly 0.70-megapixel rear camera without a flash.
Otherwise, the iPod touch (4th Gen, 2011) is very similar to the iPhone 4, featuring a 3.5" 960x640 (326 ppi) "Retina display" (a non-IPS version), FaceTime video calling via Apple ID or email, an integrated microphone, a front-facing VGA camera, iMovie editing support, a 3-axis gyroscope, and 720p video recording (with the lower-quality camera).
Powered by an Apple A4 processor like the iPhone 4, it has only 256 MB of RAM (vs. 512 MB) and was available with 8 GB, 32 GB, or 64 GB of storage. Apple's estimated battery life is 40 hours of music and 7 hours of video playback.