Features: LCD screen with LED backlight displays water depth,approximate fish location,fish size,weeds and rocks at the bottom.0.8m - 100m detectable depth range underwater.200KHz sonar frequency,45 sonar beam angle.Measurement unit of the depth can be freely switched between feet and meter.Compact and lightweight for convenient handheld operation.Powered by 4 AAA batteries (not included).Comes with a wired sonar transducer that can be attached to the hull of a kayak or boat.Suitable for ice/river/sea/raft/kayak/boat fishing.Specifications: Material: ABS Detection Depth: 0.8-100m / 2.6-328ft Battery: 4 x AAA batteries (not included) Sonar Angle: 45 Sonar Frequency: 200KHz Cable Length: 9m / 29.5ft Working Temperature: -10~458451; Size: 8 * 13cm / 3.1 * 5.1in Weight: 119g / 4.2oz Package Size: 15 * 9 * 9.5cm / 5.9 * 3.5 * 3.7in Package Weight: 560g / 1.2lb Package List: 1 * Fish Finder 1 * Sonar Transducer