1. Ice fishing: This portable fish finder is ideal for ice fishing. The blue shell wraps the transducer, allowing the sonar sensor to better penetrate the ice in winter. At the same time, the shell design can keep the transducer away from interference and improve performance by up to 30% compared to other portable fish finders. 2. Water depth display: The portable fish finder can display many useful fishing data, such as water depth, fish location, weeds, rocks, sand, etc. You can judge the approximate types of fish and fish schools by the water depth reading of the portable fish finder based on your fishing experience. 3. Handheld: The portable fish finder is easy to use and operate. You can put it in your pocket or hang it around your neck. The portable fish finder supports power saving mode, so it can keep the fish finder working continuously for more than 6 hours in ice fishing, sea fishing, etc. The blue backlight makes the display clearly visible in sunlight or darkness. 4. Underwater detection range: The detection range of the portable fish finder is 45° beam angle underwater. The detection range of the sonar sensor is 1 meter to 100 meters underwater. The water depth can be displayed in feet or meters. You can switch the measurement unit by pressing the Enter button on the portable fish finder.