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Main article: USB hardware § Connectors Available connectors by USB standard USB connectors have been increasingly replacing other types as charging cables of portable devices. Examples of peripherals that are connected via USB include computer keyboards and mice, video cameras, printers, portable media players, mobile (portable) digital telephones, disk drives, and network adapters. It has largely replaced interfaces such as serial ports and parallel ports, and has become commonplace on a wide range of devices. USB was designed to standardize the connection of peripherals to personal computers, both to communicate with and to supply electric power.

12 Comparisons with other connection methods.

As we’ll discuss below, if you have a power-hungry device, you’re better off buying a non-Apple charger (and potentially save a couple of bucks). Of course, if you have a device like a MacBook Pro that uses more than 35W of power, you should unplug any second device so as much electricity as possible can get to your laptop.

If you connect a Mac notebook or iPhone and an Apple Watch or AirPods, the Mac notebook or iPhone receives up to 27.5W and the Apple Watch or AirPods receive up to 7.5W.

If you connect an iPhone and an iPad, each device receives up to 17.5W.

If you connect a Mac notebook and an iPhone or iPad, each device receives up to 17.5W.

Apple’s support page provides several examples of how the 35W charger will divide its output: Plugging in two USB-C cables requires the charger to automatically split the output based on the device’s power requirements. You’ll get the full advertised output when you connect a single device capable of accepting 35W of power to either port. The 35W Dual USB-C Port Compact Power Adapter, on the other hand, doesn’t prioritize one port over the other.