Raymarine's 50/200Khz 1kw Bronze Thru Hull Transducer with high speed fairing block is compatible with the DSM300 sounder. The B260 Style Transducer uses Broadband Technology and Ceramic Element Technology to reach even greater depths and better fish detection. 19 degree cone angle at 50Khz and a 6 degree cone angle at 200Khz. A must have for any serious recreational or commercial fisherman. Compatible with Raymarine L755, 760, 770, 1250, DSM 30 and DSM 300.