Garmin GT23M-TM Transom Mount TransducerThe Garmin GT23M TM Transom Mount Transducer delivers dual CHIRP sonar for coastal and offshore anglers, providing a clear, detailed underwater picture with traditional sonar and DownV scanning. Frequencies: Traditional CHIRP 80 160 kHz; DownV CHIRP 245 275 kHz and CHIRP 445 465 kHz Beam width: Traditional 24 13; DownV 2. 051 @ 260 kHz and 1. 429 @ 455 kHz Maximum depth: Traditional up to 1,800 ft; DownV up to 1,000 ft Transmit power: Traditional 600