Got the black envelope today. Inside is a "Y" shaped strip with the flashing blue device over the icefly.
The flashing is a repetitive pattern (ruling out morse code), however, mine might have a short in it, as I can turn it off with a sudden movement or tap.
It came with a slip:
"We are both creatures of the senses, you and I - we inhabit the same reality, simmering just below the perceivable world.
THE PULSE IS GROWING. CAN YOU FEEL IT?"