from the manufacturer...
"Simply give the PocketFinder GPS tracker to a person or attach it to your pet or vehicle and locate the devices from our website or on your smartphone with our iOS® and Android® apps.
PocketFinder features work even while you’re not thinking about them. Best of all, they’re simple to use! Geo-fence zones, speed limits, alerts, history and power features will maximize how much value you get from using the devices." (more)