SmartCast RF15 offers a large display 4-level grayscale and an excellent operating range.SmartCast RF15 Features: Big 3 7/8" 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 RSS 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-Touch menu navigation easily controls FishID+ 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. Wet Switch technology maximizes battery life by automatically shutting down when the Advanced Remote Sonar Sensor is out of water. Waterproof design. Product : HUMMINBIRD SMARTCAST RF15 PORT. DISPLAY W/ REMOTE SENSOR Manufacturer : HUMMINBIRD Manufacturer Part No : 406350-1 UPC : 082324029301