IPhone 7 internal barometer. A Lightning-to-3.5-mm-connector adapter, as well as in-ear headphones that use the Lightning connector, were bundled with the device, and the adapter is also sold separately as an accessory. The adapter is also compatible with other iPhone, iPad, and iPod Touch devices running iOS 10 and newer. iPhone 7 uses the Apple A10 Fusion 64-bit system-on-chip, which consists of two low-power cores and two high-power cores (only two cores are used at any point in time). The A10 chip also features a hexa-core graphics chip capable of "console-level gaming". As with prior models, iPhone 7 is available in two
IPhone 3GS more favorable reviews mainly because it comes pre-installed with iOS 4. Jason Snell of Macworld praised the iPhone 3GS, saying that "the device's internal changes shines in the iOS 4 update, making the iPhone 3GS a worthwhile upgrade compared to its predecessor although a little too late compared to the iPhone 4." TIPB stated that "aside from hardware specific features like FaceTime, Retina Display, and gyroscope support, the bottom line is iPhone 3GS users are getting the same software that makes the iPhone 4 great." Shortly after the release of the iPhone 3GS, some users reported overheating of the device