We know that specific frequencies excel at detecting certain species of fish: Bluefin Tuna 60 kHz, Squid 133 kHz and Cod 175 kHz. The M265LH transducer includes all these frequencies plus every other frequency in the high and low bandwidth. This powerhouse transducer delivers excellent resolution, bottom discrimination and bait and game fish separation at all depths. The M265LH is packed with a seven-element, low frequency array that operates between 42 kHz and 65 kHz for excellent deep water performance. The high frequency ceramic operates between 130 kHz and 210 kHz with a narrow (10 deg to 6 deg), perfect for pick apart structure and pinpointing tight holding fish in structure. The M265LH includes a plastic housing which is aligned to the centerline and secured inside the hull then filled with non-toxic antifreeze. The transducer is inserted into the housing and adjusted for the proper dead rise offset, insuring the beam is shooting straight down for maximum echo return. The antifreeze provides the best medium to transmit through the fiberglass and into the surrounding water. The major benefit of in-hull transducers is no protruding features on the exterior of the hull, making it the perfect choice for trailered or lifted boats. Designed for boats up to 11 m (36 ft) with solid core, fiberglass hulls.