Airmar SS502 Stainless Steel Depth & Temp 600W, 50/200kHz TransducerThis impact-resistant, stainless steel thru-hull stem can be used on all hulls, including plaining hull powerboats and displacement hull boats. The dual frequency version provides good target detail in shallow water at 200 kHz and good deep water bottom tracking at 50 kHz. The narrow beam 200 kHz version provides excellent bottom detail. Airmar's high performance fairings are recommended for all installations to obtain the best possible performance.WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.