Garmin 010-10249-20 Dual Beam Transom Mount Transducer 4 Pin

Want to use your echo™ series fishfinder in more than one vessel - A second transducer can make the process a lot easier. It comes with all of the hardware you need to mount on your transom or trolling motor. Please Note: echo 100 is a single-beam fishfinder. When using this transducer with echo 100, it will only transmit and receive at the 200 kHz frequency.