ST180D 1kW Thru-Hull Stainless Steel Transducer – 50/200kHzThe Echonautics ST180D is a low-profile, high-frequency CHIRP thru-hull transducer, ideal for enhancing the sonar capabilities of a boat. It is designed to provide detailed imaging and excellent fish-finding performance in freshwater and saltwater.Specifications:1kW50/200kHzStainless SteelThru-Hull Transducer