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GPIO, 3.3v, rx, tx, gnd position on sonoff inching/self-locking switch

Just got one of these switches:
https://www.itead.cc/smart-home/inching-self-locking-wifi-wireless-switch.html

Does anyone know where the GPIO0, 3.3v, tx, rx and gnd are? Do we need to use a FTDI to usb since it already has a mini USB connector?
20170712_175117

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