It's no surprise that Tile's Bluetooth trackers have become a huge hit with consumers, the trackers are a no-brainer for those who tend to leave stuff behind. Their new Pro Series trackers add a bit more horsepower with an increased range of 200 ft, twice the volume, and an IP68 rating that allows it to be waterproof up to 1.5m for up to an hour. They've also improved the proximity meter and just like the Tiles before it, it will have a battery life of one year. 

$35, thetileapp.com