About 10 years ago, they came out with a device that actually warmed the doe urine for you and spread it out on the ground with a timer. I can't remember what it was called, but Jackie Bushman was hawking it on his show.
Your question is a good question and deserving of a good answer.
I'm sorry that some forum members got so far out of line and did not answer your question for you.
Code Blue Scent Dispenser is what I think that it was called.