Venterior 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. Apply to lake, river, sea and other fishing environment. Depth range from 1M to 100m.NOTE: The depth is measured from the sonar sensor, not the float. Round transducer with 25 ft cable and removable float. Can be used for fishing off the dock, on a boat, and ice fishing. Various features settings: 5 user selectable sensitivity; battery save mode; backlight mode; fish alarm; unit of measure. - Press and Hold F&FT/C&M key (for more than 3 seconds) to convert the unit of measure for depth & temperature. 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 screen) is not waterproof, so please do not submerge or spray the fish finder screen with water. Warranty: This device is covered by a 2 Year Warranty. Any questions before or after purchase, please feel free to contact customer service representative (response within 24 hours every day online).