Humminbird 535 5-Inch Waterproof Fishfinder Real Time Sonar instantly captures action, while Echo Enhancement provides incredible sensitivity 5-inch, high-definition display with 320 x 320 pixels of resolution and UltraBlack contrast enhancement 20-degree single beam sonar optimized for coverage and precision bottom detail Choose Selective Fish ID+ or view actual sonar returns Measures 7 x 7.25 x 4 inches (W x H x D), and reliable to 800 feet of depth