But..is that thing available in a collar and sized comparable or bulky? How about battery life? I am still using the two original batteries in my two collars and the cats are so far staying in range of the receiver when I do a regular sweep check. The collars and transmitters are 50$ each so I cannot afford one for all the cats, just the ones that wander alot. It is educational to find out where they roam, and they seem perplexed at not being able to hide from me anymore. If I were gonna track rockets or planes or something, I would probably go for the higher power unit though, for sure. The system as it stands works great! Good foxhunt practice on a daily basis.