RV-220S RealVision 3D(TM) Starboard Side Thru-Hull CHIRP Bronze Transducer - 20Adeg - 2M Cable - Replacement transducerThe RV-220 system features rugged cast-bronze thru-hull bodies suitable for fiberglass or wooden hulls. One transducer transmits and receives to port and downward, the other to starboard and downward, ensuring a full 180Adeg of underwater coverage even on boats with deep keels or other underwater protrusions. Features:Gyro-stabilized sonar technology: Gyro stabilization compensates for boat movement, delivering lifelike 3D sonar imagery.Wide spectrum CHIRP sonar: Transmits on 60 different frequencies for the most lifelike sonar imagery and simply the best fish targeting - hands down!Easy fish identification: Easily identify structure and locate fish with the lifelike clarity of RealVision(TM) 3D sonarPowerful four-channel sonar: Supports RealVision 3D, CHIRP DownVision, SideVision, high frequency CHIRP, and 600W 50/200kHz traditional sonar