There are a few accessories that can be very helpful when accessing the BeagleBone boards.
The first and possibly the most helpful accessory is a 5V wall outlet/mains power adapter. This will allow you to power the BeagleBone from the wall outlet instead of drawing power from a USB port. While the board can be powered by the USB port, if you want to do anything that requires more than the minimal amount of power, a 5V wall out/mains power adapter is strongly recommended. If capes or expansion boards are installed, the amount of power can easily exceed what is available from the USB port. These adapters are available from a variety of sources. The specifications you are looking for are as follows: