SI-TEX 492/50/200ST Transom Mount Transducer f/ES502. Dual Frequency 50/200 kHz. Max Power: 500W. Beam Angle: 42 deg. @ 50 kHz, 12 deg. @ 200 kHz. Housing: Plastic. Mount: Transom. Plug: 8. Cable: 30'. Temp: Yes. Speed: Yes. For SI-TEX model: ES502