Calciphylaxis. Calciphylaxis is a condition characterised by necrosis (cellular death) of the skin and fatty tissue. It is seen mainly in patients with end stage kidney disease. It is also sometimes called calcific uraemic arteriolopathy.
Besides a data link, USB provides 5 +/- 0.25 volts to power an otherwise unpowered device or charge a battery in a self powered device. A USB controller or hub is required to power one unit load (100 mA, a low power load). It can optionally power up to 5 unit loads (500 mA, a high power load).
You can buy an extra 24-watt power supply or a 48-watt power supply with a USB charging port. The 48-watt power supply doesnât charge Surface RT or Surface 2 faster than the 24-watt power supply, but its USB port is handy when you want to charge a cell phone or other USB device while your Surface charges.