The 703 and 702 use a standard USB wal wart, that accepts a standard USB cable. The output power is 5V, 1A.
That of course does not mean that this mini router is drawing one amp.
See this link TP-Link TL-WR703N [Old OpenWrt Wiki]
Looks like, in standard mode it uses around 100mA. BTW, Dude, that information took me less than a minute to find using google here from my iPad. Information at your finger tips 