The user-friendly Garmin echo 201DV Sonar clearly reveals what's under the water, helping you catch more fish. Garmin DownVü™ produces clear and precise HD-ID™ sonar images and a nearly photographic sonar view of fish and structure under your boat. Images are clearly shown on a 5"-diagonal, 16-level grayscale display. Garmin Smooth Scaling™ technology keeps you from losing sight of sonar history as the unit changes depth ranges. 300-watt RMS transmit power. Includes an all-in-one transducer for DownVü and 77/200kHz (also supports 50/200kHz with optional transducer). Comes with a quick-release swivel mount and FREE mounting kits for transom and trolling motors.