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: -10~45 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