I know very well Feliway. Having a very stressed cat life! I leave a comment concernat use when I'm not really agree with previous comments. The spray is mainly used for transport must spray the transport crate 2-3 days before departure so that your cat understands and feels good in confidence, the diffuser is used regularly to be genuinely effective, it spreads 70m2 to put in a room where the cat feels good. Here I trade stamps for Feliway for transportation and 5, 6 hours drive pure happiness unlike before. Certainly the price is not giving but it is a great product I highly recommend. That good use.