Features: 1.Extensive Testing: Portable fish depth finder detects and displays water depth, approximate location of fish, fish size, short height weeds, sand and rocks on the bottom. 2.Easy to Use: The portable fish finder can be attached to the hull of a kayak or small boat to see how the water depth changes as you pass. 3.Monitoring Range: The portable depth finder detects water depths between 2ft (0.6m) and 328ft (100m) when fully submerged. 4.Alarm Function: Depth finder thrown into the water and the display unit turned on, it will display the water depth and approximate fish depth and will receive an alert if a school of fish passes by. 5.Portable Design and Sensitivity: Fish finder is handheld and portable, with a neck strap for hanging around your neck. 5 levels of sensitivity for fishing in both clear and murky water. 6.Long Endurance: Portable depth finder works continuously for at least 4?5 hours on a new battery, and it can work for longer by switching on the power saving mode. specification:Item Type: Fish Finder Material: ABS Batteries: 4 x AAA Batteries (Not Included) Detector Cable Length: 25ft Display: TN, ANTI UV LCD Backlight: High Light LED Sensor Beam Angle: 45 Degrees Depth Range Maximum: 100M/328Feet Depth Range Min: 0.6M/2.0Feet Operating Temperature: -20C to 70C This portable fish finder is suitable for ice fishing, kayak fishing, shore fishing and sea fishing. It is one of the best fishing kayak accessories for your friends or family. It detects and shows the depth of the water, the approximate location of fish, weeds and rocks on the seabed. They will be amazed at how many fish they can catch with this fish finder. PackageList: 1 x Display 1 x Sonar Sensor (Battery Not Included) 1 x Probe Holder 1 x Fixing Screw 1 x Lanyard 1 x Manual NoteManual measurement please allow some errors.