Features: 2.8 TFT LCD display with LED backlight easy reading at night or under weak light, backlight brightness is adjustable according to different needs. Detect and display fish location and water depth. Detecting depth up to 45m (148ft). Water bottom contour and water temperature indicator. Audible fish and depth alarm. Clear fish icon display. 20-level sensitivity settings available, higher-degree sensitivity can help you get more accurate chances to detect the fish. Update the detected underwater information in time, which improves detecting accuracy and fishing success. With round wireless sonar sensor, wireless operation range reaches 100m (328ft). 90 degree sonar coverage and 125KHz sonar frequency. Quick manual zoom for bottom tracking, convenient to use. With simulation mode to help beginners to learn and use the fish finder. Compact portable design, great for river, lake, ocean fishing and other fishing environments.