An electronic device having electronic circuitry powered by a battery and having an interface for interactively coupling {HEAD ~ the electronic device} to {TAIL ~ 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 
to
An electronic device having electronic circuitry powered by a battery and having an interface for interactively coupling { HEAD ~ the electronic device } to { TAIL ~ 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
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL 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