The Eagle Supra Pro ID Fishing Fish Finder Sonar is a vintage system with a transducer, designed for both indoor and outdoor use. This black fish finder features a grayscale display with a 3.4-inch size, ideal for depth indication and fish identification. It also includes features such as a depth alarm and back light for enhanced visibility, all powered by batteries. Made of durable plastic and measuring 10 inches in length and 8 inches in height, this United States-made unit is a valuable asset for fishing enthusiasts looking for a reliable fish finder.