BooTaa Portable Fish Finder, Water Depth & Temperature Fishfinder with Wired Sonar Sensor Transducer and LCD Display Detect and display water depth & temperature, approximate fish location, short & tall weeds, sand, and rocks on seabed; Round Transducer Sensor with 32 feet cable, removable float Can be used for fishing off the dock, on a boat/canoes, and ice fishing; Apply to lake, river, sea and other fishing environment 45-degree beam angle, Depth range from 1M to 100m. NOTE: The depth is measured from the sonar sensor, not the float Various features: battery save mode, backlight mode, fish alarm Attention:1.It will turn off automatically if the depth display reads "---" continuously for 5 minutes.2.The transmitter is waterproof, but the receiver(unit with LCD screen) is not waterproof