Feature: 1. [Detect Water Condition] It can detect the depth of the water, the approximate position of the fish (suitable for all kinds of fish), the size of the fish, short and tall weeds, sand and rocks at the bottom. 2. [Easy To Use] Throw the sensor into the water and turn on the display device. If a shoal of fish passes by, it will display the depth of the water and the approximate fish depth. 3. [Multifunction] Selectable sensitivity, power saving mode, backlight mode, fish alarm, measurement unit, settings can be saved after closing. 4. [High Accuracy] For accurate depth readings, the fish detector uses sonar to detect the depth of the water and the position of the fish. 5. [Used In Mobile Kayak] The fish detector can be used on a mobile kayak with a speed of less than 5 mph (make sure the bottom of the sensor is level). 6. [Widely Application] It is widely used in kayaking, fishing, outside the dock, and can be used in salt water. Specification: Item Type: Sonar Fish Finder Material: ABS Battery: 4 x 1.5V AAA (Battery Not Included) Application: Water animal detection Support Language: English Display: TN/ANTI-UV LCD Backlight: HD LED Unit of Measurement: Feet/meter Sensor Beam Angle: 45 degrees Maximum Depth Range: Approx. 328ft / 100mMinimum Depth Range: Approx. 2.0ft / 0.6mWorking Temperature: -20~70. Package List: 1 x Fish Finder (Battery Not Included)1 x Sonar Probe1 x Probe Holder1 x Fixing Screw1 x Lanyard1 x Manual