1、Screen Display: The fish finder features a LCD screen that allows for easy readability even in low light conditions. Information collected by sensors will be displayed on the host, including water depth, temperature, fish size, underwater contours, and battery levels of both the main unit and sensors. 2、Memory Function: The fish depth finder remembers previous settings when turned off, with the option to change depth and temperature units based on your preferences. 3、Automatic Turn On: The sonar fish finder will automatically turn on when placed in water. Ensure to dry it after use, as the sensor will continue working if wet. 4、Waterproof Design: The handheld fish finder is waterproof for worry free use in water environments. However, the receiver unit is only designed for daily waterproofing and should not be submerged in water. 5、Fish Alarm: The wireless fish finder alerts you with a fish alarm when fish are detected, allowing you to quickly catch fish without having to constantly watch the float. Item Type: Portable Fish Finder Screen: Approx. 6.1cm / 2.4in Battery Life: 5 Hours Depth Detection: Approx. 0.6-36m / 2-118.1ft Sonar Frequency: 125KHz Detection Distance: Approx. 100m / 328.1ft Operating Temperature: -20-70℃ Battery Type: 4 x AAA Battery (Not Included) 1 x Fish Finder 1 x Antenna 1 x Ultrasonic Sensor 1 x Power Cord 1 x Hanging Rope 1 x User Manual