The 42mm Apple Watch boasts an aluminium case and ceramic back, measuring at 35.9x42.0mm and 10.5mm in height. While it's resistant to splashes, it's not fully waterproof. The movement offers an 18-hour power reserve and can be charged with a magnetic cable. The Ion-X glass adds durability to the watch. When synced with an iPhone, it stays incredibly accurate, only deviating from the global time standard by 50 milliseconds. The dial can be personalized and the watch has a range of health and activity tracking sensors. The current model comes in various versions, including an aluminium case with a blue Sport Band.