Garmin Fishfinder 100 Blue 3.9-Inch Waterproof Fishfinder Designed for offshore fishing enthusiasts Dual frequency 50/200 kHz sounder with temperature sensor 3.3-by-2.1-inch screen with 4-level gray Maximum depth of 1,200 feet Power output of 300 watts (RMS) and 2400 watts (peak to peak); waterproof and easy to install