I noted three modes of operation.
1. Embers always lit
2. Embers flashing rapidly
3. Embers flashing from bright to low and then back to bright.
However, one thing I did notice with mine is that when I set the mode I want and then shut off power it reverts to the default start up mode (embers always lit). Which is a pain because everytime I start up my layout, I have to reset the mode of operation to the one I like....which is bright to low.
-Pete