The Pathfinder Application requires the Pathfinder Connector device and works Android 4.3 or higher and up with Bluetooth 4.0 and BLE. The Dogtra GPS Application works with the Dogtra Pathfinder and brings GPS tracking and E-collar training right to your smartphone. Features: GPS dog tracking includes access to terrain and satellite map views with a powerful zoom capability that provides greater live-action detail and accuracy when you're in the field. Dog training features in Nick, Constant, and audible Tone, for serious dog trainers and owners who demand the most working, hunting, and competitive situations. Ability to track up to 21 dogs or hunters, share locations, playback data, create customizable geo-fence alerts, off-line map mode for areas with limited cellular data, and more. ※ During the Bluetooth connection - Continued use of GPS running in the background can dramatically decrease battery life.