Features: 1.Portable: This sonar fish finder is a portable and user-friendly device that allows you to easily detect fish underwater using ultrasound sonar technology. 2.Accurate Depth Detection: With a depth detection range of 0.6 to 100 meters and a precision of 0.1 meter, this portable fish finder provides accurate and reliable information about the depth of the water, helping you locate fish more effectively. 3.Customizable Measurement Units: Users can choose between meters or feet from this echo fish sounder as their preferred measurement unit, ensuring convenience and compatibility with their fishing preferences. 4.Clear LCD Display: The alarm transducer features an LCD display that shows all the necessary information in a clear and easy-to-read format. The shallow green backlight enhances visibility even in low-light conditions. 5.Waterproof Design: fish finder detector, 100M, 45 degrees sonar coverage, echo sounder alarm transducer, lake fishing, sea fishing Description: This 100-meter detector with 45 degrees sonar coverage and echo sounder alarm transducer is designed for underwater fish finders. Ideal for lake and sea fishing, it helps locate fish easily.     这款 100 米探测器有哪些优势？ 这个探测器可以在哪些水域使用？ 提供一下这款探测器的使用说明。   Specification: Origin: Mainland China Sonar Coverage: 45 Degree Sonar Frequency: Cable: 200Khz Power Source: No. 7 Battery Material: ABS Color: Black Yellow Package Size: 270.00*170.00*60.00mm/10.53*6.63*2.34in Wire Length: 10m/390in