Absolute Portability... With dozens of new features including WeedID, Mountable and Side-Scanable Sonar Sensor, Headphone Type Sensor Plug, and 4 User Selectable Sensitivity Settings, the FF3355P is guaranteed to produce even bigger fish stories... To Use: Simply turn the power on, toss the unique floating sonar sensor from the shoreline, bridge, or boat and instant depth, fish, weed, and bottom contour readings are now in the palm of your hand.