While some don't see the Apple Watch as all that much of a success, the fact is that the watch may end up being an even bigger success that the iPhone.
Apple rates the environmental impact of its devices on five factors. One factor is expected lifespan. iPhones and Apple watches are rated at three years.
Dennis Anselmo from Alberta, Canada thought had flu-like symptoms, but his Apple Watch showed an abnormal pulse. Turned out he was having a heart attack.
For the first time since 2008, Apple shares experienced a down year in 2015. According to some analysts, this is a sign of Apple's momentum slowing down.
FitBit remains top of the wearables market with 22 percent market share, but Apple is quickly catching up with 18 percent, despite the price discrepancy.