I got these for my dog and because I am always losing my keys. This works great for that. You download the app then sync it, you have to make sure you wake up the tracker once every 48 hours because if you let it go in sleep mode it won’t be found by app. I just make sure it’s on every morning or whenever I do have my keys. Like the battery because I just got a big pack of this type from my local store at a really cheap price and they usually last a long time. I like the recording option. I left one hanging in my kitchen so as I run out of things I can make a recording and then later transfer to my list ( yes, I still prefer paper and pen lists). I’m going to put one on remote, this I wish was better because it’s really only made for key chain fits. We are going to either tape it or rubber band rig it so it will stay on the remote, but it be much more convenient if it worked for rings and attached to things. Overall, especially at the price it functions very well. The most important thing is when I’m in a hurry I will have help finding the keys and I get to keep an eye on my Cute chihuahua. Also, you can use if at big parking lot to help find car, I thought that was pretty neat.