I bought one this season, after talking with a friend that used one.
The doe in estrus bleat. I was told to simply roll the can and repeat this every so often.

I did this and did infact get a response. Just never saw the deer?

It can also be used to grab the attention of a deer spotted but walking away. Roll the can a few times, slowly.

Let us know if you have any luck or what you experience.

Good luck and safe hunting!

KEEP HUNTING THE GREAT OUTDOORS & GOD ALIVE, PASS IT ON!