OS: iOS, Android
Recurring Fees: None, but it will need replacement after one year.
This is a simple locator. It doesn’t offer true GPS, but has a range of 65-98 feet. The device is trackable by anyone with the app. There is no limit to how many protectors you may add to the strap. They call this crowdsourced GPS. It last one year, never needs recharging, is dust and waterproof.