However , an extension to USB standard specification called USB On-The-Go -LRB- the capitalization oddity is deliberate -RRB- allows a single port to act as either a host or a device -- chosen by which end of the cable plugs into the receptacle on the unit .

However , an extension to USB called USB On-The-Go allows a single port to act as either a host or a device -- chosen by which end of the cable plugs into the socket on the unit .
