Hi DevBiker! Thanks for your kind response. I arrived at the same conclussion as you, but I wasn't sure. I would like to try to plug it to the PSU, buy I was afraid to fry the leds (for voltage restrictions) (I'm sorry if "fry" isn't the adequate term, I'm argentinian!).
And the answer to your question is: No, it has not any buttons.
Thanks again!
Cholo