Wireless and castable - Eliminates long and heavy transducer cables. The wireless sonar transducer can be cast, used from kayak or boat, cast from shore, or used for ice fishing in lake, river, or sea environments. Clear color display - Clear color TFT LCD display with two selectable background colors (black and white) for readability in bright sunlight or at night. Depth and fish detection - Detects and displays water depth, water temperature, fish size (small/medium/large), fish depth, and bottom contour. - Provides working and simulation modes. - Depth and temperature units can be converted. - Sonar beam angle: 105 degrees. - Depth range: 2.6 to 131 ft (0.8 to 40 m). - Wireless distance range: 262 ft (80 m). Punch-free installation - Sensor can be installed without drilling holes in the hull. - The wireless sensor has two small holes to tie the fishing line, allowing you to cast it as far as possible. Notes and operation guidance - To turn on the display, press and hold for 3 seconds. - If the display shows "-" for about 5 minutes to save power, it will turn off. - After casting the sensor into the water, wait a few seconds for the unit to update water depth. - The sonar transmitter turns on automatically when placed in the water. After use, dry it to stop operation and prevent continued activity. Use scenarios - Kayak or boat trolling: monitor depth, temperature, and fish activity while moving across lakes or rivers, helping you locate structure and fish schools. - Shore casting: cast from the bank and read depth and bottom contour to identify productive drop-offs or channels. - Ice fishing: drop through a hole and use the depth, temperature, and fish size readings to determine fishing spots and optimize jigging location.