The FishHunter is a military grade fish finder that uses your iOs device or Android device via Bluetooth technology. The FishHunter app allows you to store catch locations with GPS, track weather conditions, store catch info in a logbook, and of course view the fish below the surface down to 120 feet. On a full charge the FishHunter will be finding your fish for six to nine hours. The FishHunter charges by setting the unit on the included charging dock (pictured above). For your viewing pleasure we have included a video.