But this time they sell it included the controller(TPLINK TL-MR3020) & usb cable.
OFC the power supply is not included. You need to buy it in computer store.
TPLINK TL-MR3020 will act as "PC". Basically technobit upgrade the TL-MR3020 firmware to openwrt.
You can access the configuration page using web interface by calling the TL-MR3020 ipaddress from your computer.
For more information about the controller please read here https://bitcointalksearch.org/topic/how-to-upgrade-tplink-tl-mr3020-firmware-to-technobit-openwrt-476326
Or you can ask me
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The TPLINK is common and easy to get at most online computer stores (Ex. newegg etc.). Normally around 20 dollars. On power it also has PCI-e where that is extremly easy if you have a PSU sitting around.