The Garmin GT15M-TM transducer is ideal for boaters who need to install their transducer on a boat's transom. The transducer provides clear bottom definition underneath the boat as well as crisp, clear, and wide fish arches with excellent target separation. The 8-pin transducer features mid-band CHIRP traditional sonar (85-165 kHz) and has a power rating of 600W. Maximum depth of 1, 900'. Crisp and clear wide fish arches Durable, marine-grade construction | GT15M-TM Transom-Mount Transducer