It must be plugged into a high - power USB power adapter , such as the HP TouchPad power adapter or a newer high - current USB adapter .
The Touchstone has a USB power cable attached to it with a USB Standard - A plug on its end .
Touchstone must be plugged into a high - power USB power adapter , such as the HP TouchPad power adapter or a newer high - current USB adapter .
The Touchstone has a USB power cable attached to it with a USB Standard - A plug on its end .