USB-DC Plug Cable 2.5x0.8mm (Hardkernel) USB to DC Plug-Inner diameter 0.8mm

DC Plug specification : Inner diameter 0.8mm and outer diameter 2.5mm
Cable Length : 800mm approx. (32 inch)

USB host port on your PC or Smartphone chargers can supply the power to ODROID-C via this cable.

Note that you must check the voltage on the USB host between 4.75V and 5.25V at 1Amp load. 
Anything outside this range will cause the malfunction of ODROID.