Airmar B265LH Bronze Chirp Thru Hull 1kW w/Fairing Block - Requires Mix and Match Cable [B265C-LH-MM]B265LH Bronze Chirp Thru Hull 1kW with Fairing Block Requires Mix and Match Cable Imagine knowing what exact frequencies work the best at detecting specific fish species: Bluefin Tuna60 kHz, Squid133 kHz, and Cod175 kHz. Now imagine tuning your fish finder to these frequencies, marking the fish precisely on the screen, then catching them! With the B265 transducer connected to a tunable fish finder, you too can have a log book like a commercial