A power delivery connection between a power adapter and a power using device
greater than 10 W and up to, but less than 240 W, is defined in this standard. A communications
link between the power adapter and the mobile power-using device is also defined. The
communications may be used to coordinate the power delivery and provide identification between
the power adapter and the power-using device. While intended for portable computing and
entertainment devices, power adapters conforming to this standard may also be used with other
devices (including simple devices, with no communications capabilities, up to 20 W).