My experience is to tell you to stay away from the KR22A credit card one the range sucks at least for me 2 feet with new batteries!
The only thing in my setup that I have a range issue with!
The KR18A I will recommend I've been using mine for years without replacing the batteries, But I'm sure the day will come soon!
I guess I don't use it as much as some would!
I get about 50 feet with it! Not bad for a small remote!