Feature: 1. LED LCD DISPLAY: The receiver unit features an LED LCD display for reading in the dark, showing information collected by the sensor such as water depth, temperature, fish size, underwater contour, and battery levels. 2. CUSTOMIZABLE SETTINGS: The unit remembers previous settings when turned off, with depth and temperature units adjustable based on your preference. 3. AUTOMATIC ACTIVATION: The sonar sensor transmitter automatically activates when placed in water, ensuring convenience but remember to dry it when not in use to prevent continuous sensor operation. 4. WATERPROOF SENSOR: The sensor is waterproof for durability, allowing safe operation in water, while the receiver unit is only waterproof for daily use and should not be submerged. 5. FISH ALARM: The fish alarm alerts you when fish are detected, allowing immediate catch without staring at the float for a long time, offering practical and user friendly functionality. Specification: Item Type: Portable Fish Finder Material: ABS Electronics Screen: 2.4 inches Usage Time: 5 hours Depth Detection: Approx. 0.6 to 36m / 1.97 to 118.11ft Sonar Frequency: 125KHz Detection Range: Approx. 100m / 328.08ft Working Temperature: -20 to 70℃ Battery Type: AAA Battery x 4 (not included). Package List: 1 x Fishing Detector Main Body 1 x Antenna 1 x Ultrasonic Sensor 1 x Power Cord 1 x Hanging Rope 1 x User Manual