The user-friendly 561 DI sonar packs Down Imaging® and DualBeam Plus™ technology into an affordable unit. Easy-to-read, 320V x 320H, 12-level-grayscale, 5" display. Down Imaging technology delivers exceptional detail directly below your boat. DualBeam Plus expands the sonar coverage to an area equal to the depth of the water you're fishing. 500-watt RMS and 4,000-watt peak-to-peak power output.