What more can I say, Outstanding!! It's rare for me to leave reviews but i felt I had to on pettracers brilliant tracker system. they must have spent ages designing it. We have been after a proper tracker for years now and finally....thank you, brilliant support from Anna @ customer services also btw. It wasn't bought to see where our cats are going, even though this feature is very useful and was an eye opener! quite fun to go walking through the fieIds and pay them a surprised visit to see the look on their faces, priceless :-) It was purchased after spending many years looking for a tracker that does what it should do and it does exactly that, the base station is genius, especially as you can make it into a mobile tracker system if your pets have wandered like ours do, it turns your tracker system into one that can also use radio frequencies to locate your pud (it'll go through brick walls, sheds and the likes where all the other tracker systems on the market do not, they only locate via GPS so if your cat is holed up under cover inside a shed or farm building etc, you're stuffed, you won't find them, you could walk straight past them!!) You can also activate a flashing white LED on the collar from the app that's handy too. Good addition is the reflective tape for the collar, a good torch spots it far away. I could go on but I'll leave it at that, you won't be disappointed...oh yes...one more thing, we have a 13 year old cat that has never warn any type of collar in his life, just trying to put a fabric one on is sufferable by risk of injury to myself and my hands, tonight, he is wearing a pettracer collar, no injuries to me, after 10 minutes of not moving, he's now scoffing his food like normal and all's well in the house.