Furuno B265LH Bronze Thru-Hull CHIRP Transducer - 12-Pin [B265LH-12P]B265LH Bronze Thru Hull CHIRP Transducer 12 Pin Bronze, 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 block Traditional marine Fish Finders operate at discrete frequencies such as 50 kHz and 200 kHz, use relatively short duration transmit pulses, and use