"One of the most useful tools in a fisherman’s armory is a fishfinder. But what if you want to fish from a dock, kayak, or SUP? The iBobber could be your solution. Completely self-contained, iBobber looks more like a toy than serious fishing equipment. The iBobber is a castable fishfinder that connects to your Android or Apple device via Bluetooth. It displays depth, water temperature, bottom contours, and all the other information that anglers rely on. Suitable for both freshwater and saltwater fishing, the iBobber runs for up to 10 hours on a single charge."