Humminbird AccesoryTransducer Switch The Transducer Switch lets you toggle between two transducers connected to one sonar unitperfect for boats with both trolling and transom mounted sensors. A simple flip of the switch selects the preferred transducer for accurate readings in different conditions. Built with waterproof marine connectors and corrosion proof hardware, this accessory ensures clean signal transfer and long service life. Easy to install and compact in