Wireless Portable Fish Finder: designed for easy transport, this device is compact and wireless to accompany you on fishing trips without clutter or cords. 40M Sonar and Depth Alarm: builtin sonar detects fish up to a depth of 40 meters, with a depth alarm that alerts you when fish are at your desired depth. LCD Screen for Clear Performance: the builtin LCD provides realtime data including depth, fish depth scale, water temperature, and additional performance information. Multifunctional Fishing Helper: provides immediate fish detections and depth data, eliminating the need to constantly watch the float, serving as a practical, versatile tool to enhance your fishing experience. Practical Use Scenarios: ideal for use on a boat in lakes, rivers, or coastal waters; suitable for shore or jetty fishing; helpful during longer sessions where quick depth and fish information improves efficiency.