This Portable Fish Finder (measures up to 328ft deep) is handheld device that works in both freshwater and saltwater—perfect for river boat fishing, ice fishing, or shore fishing. It uses a sound wave sensor (attaches to kayaks/boats) to show real-time water depth (3ft–328ft / 1m–100m) and approximate fish locations, plus bottom details like plants, sand, and rocks. The screen is easy to see in sunlight or dark (with adjustable backlight), and you can switch between feet/meters for depth. It fits in one hand, comes with a neck strap, and has 5 sensitivity settings for clear or murky water. An alarm sounds when fish swim nearby. Runs 4–5+ hours on new batteries (longer in power-save mode). Stop guessing where to fish—this tool shows you the best spots instantly!