1.[Wireless and castable]: No more long & heavy cable for transducer. Clear Color Screen: it comes with clear color TFT LCD display (2 screen background colors selectable - black and white), which enables you to read the screen in bright sunlight or at night. It applies to lake, river, sea and other fishing environment. Suitable for trolling from a kayak or boat, casting from the shore or using for ice fishing. 2.[Depth and individual fish detection] It detects and displays water depth, water temperature, fish size (small/medium/large), fish depth and bottom contour. It has working and simulation modes. The measurement units of depth and temperature can be converted. Sonar beam angle: 105 degrees. Depth range: 2.6-131FT / 0.8-40M Wireless distance range: 262FT / 80M 3.[Punch- installation] The sensor can be installed without drilling holes in the hull. The two small holes on the wireless sensor allow you to tie the fishing line together and then throw it into the water as far as possible. 4.[Note]: 1. Please press and hold for 3 seconds to turn on the display. If the deepin display shows '-' for 5 minutes to save power, it will turn off. 2. When you throw the sensor on the water, please wait a few seconds for the unit to update the water depth. 3. After pouring the sonar sensor transmitter into the water, it will automatically turn on. Please dry when not in use, otherwise the sensor will continue to work