SmartCast RF15 offers a large display, 4 level grayscale, and an excellent operating range. Features Big 3 78' diagonal display with 160V x 132H resolution. Rugged carry case with non skid bottom and RSS storage. True 4 level grayscale delivers clearly better images of the bottom, fish and structure. 100 ft remote operating range, 100 ft depth capability. Large, easy to see digital depth readout. Backlight for night fishing. New illuminated Advanced RSS153 with water surface temperature included. Display powered by 8 replaceable AA batteries not included Includes one waterproof programmable Advanced RSS for either Channel A or B operation mode. Ultra wide sonar coverage equal to twice the water depth. One Touch153 menu navigation easily controls FishID153, depth range, fish alarm, and sensitivity. Advanced RSS typically lasts for 500 hours of in the water usage. Advanced RSS replacements available on this web site, at your local tackle dealer and major outdoor retailers.