The Apple Watch was released on April 24, 2015 and quickly became the best-selling wearable device with 4.2 million sold in the second quarter of the 2015 fiscal year. The Apple Watch Series 2 was released in September 2016, along with the Apple Watch Series 1. The Apple Watch Series 3 was released on September 22, 2017. Apple Watch connected via Bluetooth to the iPhone and accessed its compatible apps. Apple’s development process was held very much under wraps until a Wired article revealed how some internal design decisions were made. The goal of the Apple Watch was to enhance the uses of an iPhone while also providing the user with some additional new features.