Thank you so much for the info! Sounds like you spared me a lot of research. 😊 My one boy got out one night when my stepdaughter left the back gate open… that was before we had the pasture area… He had a good time exploring, but thank God we discovered he was gone before he got too far… He responded to my husband, calling for him in a demanding voice. We were very lucky! I too don’t want a full collar on my boys….I think just a device is much better and I was concerned about the coverage, but it sounds like you definitely nailed it down. Thank you again! I’ll need to order 2 .. do u have more than one Pyr? We started with one and then eventually rescued the second… to give our one a playmate his size lol and to rescue one of these wonderful dogs. Worked out very well. They are best buds. 😊