1. The portable fish finder with 2.4 inch TFT colour LCD screen can detect and display underwater contour, water depth, water temperature and fish size with depth. There are two user modes: WIRELESS/SIMULATION. You can try all functions in simulation mode and go fishing in wireless mode. 2. The wireless sonar converter with fish attractive lamp makes it easier to track fish with the portable fish finder. It has a transparent replacement cover so you can see where the sensor is located even in the dark. 3.The wireless fish finder supports a wireless range of 60m and depth detection of 45m. There is an antenna on the left top of the handheld device, please pull it out. With the portable fish finder, you can go fishing in different ways, e.g. ice fishing, river fishing, sea fishing, offshore fishing, kayak fishing or night fishing. 4.Various function settings: the portable fish finder can change sensitivity, screen brightness, depth range, zoom, depth alarm, fish alarm, fish symbol, units and select language. The wireless fish finder is easy to use.