That’s true. After so many minutes, you have to blow into it again.
One of my kids had this in their car and I tried blowing into it and couldn’t blow hard enough to where two more tries and it wouldn’t allow me to start the car! I wasn’t drinking, just wanted to see how to work the dang thing!
I’d be talking to the guy and this muted foghorn kept coming in. Over and over and over. It must be like every 5 minutes in his car. I had no idea such things existed (other than to start).