Airmar B117 Transducer 50/200kHz Dual Frequency

Overview

Who This Is For: Recreational anglers and boaters running fiberglass or wood hulls up to 26 feet who need solid depth and temperature capability without overcomplicating their setup. If you fish inland waters or coastal areas where you're not pushing extreme depths, this transducer delivers everything you need at entry-level money.

Product Summary: The B117 is a straightforward dual-frequency transducer that gives you 50 kHz for deep reach and 200 kHz for detail in shallower water. At 600 watts of power, it's got enough punch to read structure and bottom composition in most freshwater and light saltwater conditions. The low-profile bronze housing sits nearly flush with your hull—only 5 mm protruding—so it won't slow you down, and you get the option of adding fast-response water temperature sensing to monitor conditions on the fly.

Key Features

• Dual-frequency ceramic element (50/200 kHz) — switches between a wide 45° beam for depth performance down to 1200 feet and a narrow 12° beam for detail down to 700 feet — lets you choose between coverage and precision depending on what you're fishing.
• 600 watts of power — solid output that cuts through noise and delivers clean readings in a range of water conditions.
• Optional fast-response temperature sensing — monitors water temperature in real time so you can track seasonal patterns and follow baitfish movement.
• Low-profile bronze housing — minimal hull projection (5 mm) reduces drag and keeps your boat running clean, especially important on smaller craft where hydrodynamics matter.
• Right-angle cable exit — the connector comes out perpendicular to the transducer body, saving space below deck and protecting the unit if someone steps on it during maintenance.
• Flexible hull mounting system — includes a rubber washer that lets you tighten the hull nut securely even on irregular or curved surfaces.

Specs & What's Included

Compatibility: The B117 is built for fiberglass and wood-hulled boats. Bronze housing is standard; plastic (P319) and stainless steel (SS60) models are available to match your specific hull material. Best performance through 7° deadrise; accommodates hulls up to 12° deadrise. Maximum vessel length is 26 feet. Requires a 2-inch diameter thru-hull mounting hole. Not sure if this works with your boat or sounder? Call or text us at (833) 831-4077 — we'll tell you straight.

In the Box: B117 transducer with ceramic dual-frequency element, rubber hull mounting washer, and right-angle connector cable. Your fish finder head unit is sold separately—the B117 connects to any compatible sounder via standard cable.