Device	Resolution	Profile	Level
iPod touch 1st generation (2007) iPod nano 4th generation (2008)	640*480	Low-Complexity version of the H.264 Baseline Profile	1.5 Mbps
	640*480	Baseline Profile	2.5 Mbps, Level 3.0
iPhone 4 (2010)	720p	Main Profile	Level 3.1
iPhone 4s (2011) iPad 2 (2011) iPad 3 (2012)	1080p	High Profile	Level 4.1
iPad Air 2 (2014) iPhone SE (2016)	4K	High Profile	Level 4.2

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Reference:

iPod nano (4th generation) - Technical Specifications

iPod touch - Technical Specifications

iPhone SE - Technical Specifications

iPhone 4 - Technical Specifications

iPhone 4S - Technical Specifications

iPad 2 - Technical Specifications

iPad (3rd generation) - Technical Specifications

iPad Air 2 - Technical Specification