Fish Finder & Depth Finder: This is a portable fish finder that can display the approximate location of fish and water depth. The sonar transducer can be attached to the hull of a kayak or boat to understand the change of water depth when you pass by. The water depth detection range is between 1m and 100m when the transducer is completely submerged in the water. Useful Data Display: Besides fish depth and water depth, the portable fish finder will also display short and tall weeds, sand and rocks on the bottom. Meanwhile, the depth measurement unit can be freely switched to feet or meters. The screen is also visible in the sun or in the dark by turning on the backlight. Portable and Handheld: The size of the kayak fish finder is designed for one hand operation. Included in the package is a neck strap that allows you to wear it around your neck when you are busy on the kayak or boat. Meanwhile, 5 levels of sensitivity adjustment allow you to fish in both clear and murky water.