FishMark 320 Portable Fishfinder Comes with Porta-Power Pack case and portable 200 kHz Skimmer transducer with suction-cup mounting bracket (batteries not included). Port-Power Pack case and portable 200 kHz Skimmer® transducer with suction-cup mounting bracket (batteries not included) 5" (12.7 cm) diagonal screen High-definition 320 x 320 Film SuperTwist LCD 16-level grayscale Depth capability to 800 ft* (244 m) with 1500 watts of peak-to-peak power (187W RMS) FishReveal™ feature exposes fish targets hidden in surface clutter, weed beds, thermoclines, and other types of underwater cover Adjustable ping speed with automatic HyperScroll™ to display fish targets at higher boat speeds FasTrack™ vertical bar flasher displays real-time sonar returns and relative strength of each target Advanced Signal Processing (ASP™) automatically adjusts your settings for the best sonar picture Patented GRAYLINE® separates fish from nearby structure and bottom Advanced Fish I.D.™ shows underwater targets in different sizes of fish symbols FishTrack™ displays target depth readings above fish symbols Selective on/off sonar alarms: Shallow, Deep, Fish and Zone Rugged, reliable, completely sealed and waterproof casing, even for use in harsh saltwater environments Uses 8 D cell batteries Full one-year warranty