The second generation of iPad Pro was announced on June 5, 2017, alongside iOS 11 at WWDC 2017. The second-generation iPad Pro models, at 10.5-inch and 12.9-inch, have an A10X Hexa-core CPU and with a 12-core GPU, Apple's ProMotion display technology which supports HDR10 and Dolby Vision content (with iOS 11 or later) with a 120 Hz refresh rate and their True Tone display is 50 percent brighter than the earlier models; both sizes also have a 12-megapixel rear-facing camera with quad-LED True-Tone flash and a 7-megapixel front-facing camera with Retina Flash.[1] They have USB-C connection speeds using Lightning cables, with USB-C fast-charge support.[2] The second-generation iPad Pro has storage capacities up to 512 GB (1 GB = 1 billion bytes).