International orders of the AIRcable Serial don't ship with a power supply because of the different voltages and outlet configurations. We recommend using a standard wall transformer with a 1.3mm
power plug, supplying a minimum of 5V DC, minimum 100mA or even batteries. Plus is on the inner barrel, minus is on the outer sleeve.
The AIRcable Serial module requires external power (DC 5-15V) but can be powered through pin 9 of the DB9 connector (DC 5-15V).