Chris, thank you for your help, I will order a converter to be able to act quickly.
My problem update:
After several attemps (power on-off) Omega Onion led became solid and it finally connected to the Wi-Fi network and I reached it through web browser interface via WiFi. I don't know what triggerred this failure mode.
However there is a problem with the Omega; my device is running continuosly and after about 1 day I cannot connect it via web browser at local network. I experienced this problem more than once. It still functions and active at cloud, strangely does not respond at local network(WiFi) via Putty or web browser.
The blue Power LED indicates if there is power flowing to the Omega. Don't know if the flickering green leds are normal, but mine do the same, probably because there is not battery connected. You can read more about the Power Dock here.