B265LH Bronze Thru-Hull CHIRP Transducer - 12-PinBronze, Thru-Hull CHIRP Transducer with 12-Pin Connector, Low-Freq: 42-65 kHz, High-Freq: 130-210 kHz.The B265LH is a bronze thru-hull CHIRP transducer for use with Furuno's CHIRP broadband Fish Finders. The B265LH comes complete with high-speed fairing blockTraditional marine Fish Finders operate at discrete frequencies such as 50 kHz and 200 kHz, use relatively short-duration transmit pulses, and use narrowband sonar transducers. In contrast, CHIRP (Compressed High-Intensity Radar Pulse) uses a precise sweep pattern of many frequencies within a long-duration transmit pulse from a broadband transducer. The equivalent sound energy transmitted into the water is 10 to 1,000 times greater than a conventional marine Fish Finder. The echo energy returning to the transducer is likewise superior to that generated by a conventional transducer. The combination of CHIRP, a broadband transducer, and Furuno's superior Digital Signal Processing, results in dramatically increased fish and bottom detection.The B265LH CHIRPS across the following bandwidths: Low-Frequency: 42-65 kHzHigh-Frequency: 130-210 kHzThis product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.