Review on Bluetooth Key Finder and Phone Tracker for Android/iOS - Anti-Lost Locator Device with One Touch Find - NUT Item Tracker for Keys, Backpack, Phone, Wallet - Improved Version 1 by Aravind Joshi

This is a fantastic little device. Although the device connects via Bluetooth, it will alert your phone if it loses connection (because it's out of range) and remember its last location. It includes an extra battery in the box and the batteries are easy to find in stores if you need to replace them. It's a good value compared to the convenience. Very easy to set up and use. I bought it for my wallet so I was concerned about how thick it would be as I didn't see any reviews discussing this / including a picture showing this. This made my wallet a little harder to close (my wallet has a round magnet closure) but it wasn't as thick as I expected based on the photos in the product description. All in all I can recommend this device and will definitely buy it again!