The PM411LM-W Ultra Wide Beam CHIRP Depth Pocket Keel Mount Transducer. Compatible hull material: fiberglass. Max Power: 2000 watts. Frequency: Low 40-60 kHz and Medium 80-130 kHz. Beamwidth: Low constant 40 degrees, Medium constant 8-13 degrees. Cable: 30ft (9.1m) cable with connector for connection to CP450C, CP470 and CP570.