The Simrad DST800 is a smart, compact, thru-hull transducer offering accurate depth, speed, and temperature data. This single-unit, multi-sensor concept provides boaters with a cost-effective alternative, requiring only one hole to be placed in the hull. Network-ready, the DST800 easily connects with NSS, NSE, or NSO systems and IS20 instrument displays. Its 235 kHz frequency prevents mutual interference with any other echo sounders on the boat. If you should need to remove the transducer, the innovative plastic housing has a self-closing valve that minimizes water flow into the boat.