Airmar B265LM Transducer CHIRP Dual-Band Thru-Hull

Overview

Built for serious anglers fishing mid to deep water—whether you're chasing walleye and stripers on large lakes or working offshore structure on your center console. The B265LM is the workhorse thru-hull transducer for boats 25 feet and up that need depth capability beyond 1500 feet and the frequency flexibility to match what's actually biting.

This is a dual-band CHIRP transducer that gives you 73 kHz of total bandwidth in one bronze housing. That means you're not locked into one frequency—you get low-frequency reach for deep water, medium frequencies for structure and suspended fish, and everything in between. One kW of power delivers the sonar definition you need to separate bait from gamefish at any depth, and the included high-performance fairing keeps the signal clean even when you're running 30+ knots.

Key Features

• Dual-Band CHIRP Architecture — operates across 42–135 kHz with 73 kHz of total bandwidth — you cover all the popular frequencies (50, 88, 107 kHz) without switching transducers, giving you flexibility to match hatch and structure type.
• 1 kW Power Output — delivers crystal-clear bottom discrimination and bait/gamefish separation at all depths — the extra wattage cuts through noise and thermoclines so you see what's actually there.
• Low-Frequency Band (42–65 kHz) — reaches down to 3000 feet with 25°–16° beamwidth — essential when you're scouting deep structure or fishing below the thermocline where gamefish stack.
• Medium-Frequency Band (85–135 kHz) — covers the 457-foot sweet spot with 16°–11° beamwidth — ideal for suspended targets near structure and detailed bottom imaging in moderate depths.
• Bronze Housing with High-Performance Fairing — maintains clean acoustic signal at high speed without turbulence degradation — critical if you're running 30+ knots to fishing grounds.
• Fast-Response Temperature Sensing — built-in water temperature gives you real-time thermal layer data — helps you locate the active bite zone fast, especially in seasonal transitions.

Specs & What's Included

Compatibility: Works with any CHIRP-ready fish finder head unit (Humminbird, Garmin, Lowrance, Simrad) that accepts external dual-frequency transducers. Thru-hull mount requires fiberglass or wood hull with deadrise up to 20°. The 4.75" shaft is sized for boats 25 feet and larger. Not sure if this works with your setup? Call or text us at (833) 831-4077—we'll tell you straight.

In the Box: B265LM transducer body, high-performance fairing, urethane acoustic window. Cable and connector are sold separately—you'll need to source the appropriate transducer cable for your head unit.