My CO Detector was chirping 3 times indicating it was in need of replacing. It was coming up on 8 years old, so I was OK replacing it. On the back of it was model "CO250RVA". I went on Amazon and could not find CO250RVA but found CO250B, so I ordered that. Soon after I did find the Model listed as CO250RVA. It was listed at $10 more than the 1st one I ordered but figured that was due to the RV compatibility. Note: all were made by BRK. So I canceled the CO250B and ordered the CO250RVA. When it arrived today it was Model CO250B not CO250RVA. I called BRK/First Alert and a customer rep said, "I think CO250RVA was an older model and I think the owner's manual says that CO250B is approved for RV use". I am not too assured when a rep says, "I Think..." so I read the manual, fine print and all, and it does say it can be used in "Mobile Homes". In my opinion Mobile Homes are stationary and not bouncing down the road. I also went to the BRK/First Alert website, and they did list Model CO250RVA, but when I clicked on "More Details" it said "Page not Found". Does anyone know more about this issue? Is there a Model CO250RVA? Is CO250B ok for use in an RV? Did I just spend an extra $10 for an "RV Approved" model when it was really the basic model?