For use with Geonav F170 Fishfinder. The through hull compact transducer provides both depth and temp data. It's flared shape makes installation easier, a single hole, that's it. The port and starboard beam is able to measure depth even if the transducer is mounted on V-shaped hulls or on healing sailboats. The retractable structure makes maintenance operations easier and the 90 degree cable connection reduces transducer height to a minimum. Cable length: 10m