{HEAD ~ An electronic device} having electronic circuitry powered by a battery and having {TAIL ~ an interface} for interactively coupling the electronic device to a host device, for switching the power source by which power is supplied to the electronic circuitry, and by determining an interface status as being coupled to or detached from the host device 
having
{ HEAD ~ An electronic device } having electronic circuitry powered by a battery and having { TAIL ~ an interface } for interactively coupling the electronic device to a host device , for switching the power source by which power is supplied to the electronic circuitry , and by determining an interface status as being coupled to or detached from the host device
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH