My GF bought me a vex sonar phone before I picked up a dedicated ice unit that I wanted. No it isn't designed for the ice, but it actually worked fine the one time that I used it ice fishing. Maybe conditions were more favorable to it functioning that day, I only did that once though. Regardless of its intended purpose and function, the battery life was far too short for me. 4 hours continual I think? Not enough. For me. Still a neat little item.