Garmin GT15M-TMGarmin GT15M TM GT15M TM transducer is perfect for fishermen who want clear bottom definition under the boat as well as crisp, clear and wide fish arches with excellent target separation to depth up to 1,900 feet. The 8 pin transducer features mid band CHIRP traditional sonar (85 165 kHz) and has a power rating of 600 W. It can be mounted on the transom. Follow the included installation instructions carefully to avoid damaging your boat.