Estimote stickers power attribute

I’m using the nodejs module bleacon. When scanning, i’m getting values for power as 1, 2, 3, 7, 5, 6, 4 or 8. Do these values map to the actual measured power? If not, what do these numbers represent?
Thanks.

It is in fact the power with which the sticker transmits the packets. (I believe 1 being -30 dBm, and 8 being +4 dBm.)