Humminbird XM 9 20 MSI T MEGA Transom Mount Transducer [710262-1]XM 9 20 MSI T MEGA Transom Mount Transducer MEGA SI, MEGA DI, DualBeam PLUS, 20 60 86 55 degrees, 200 83 455 800 kHz and 1. 2 MHz, temperature built in. For HELIX MEGA Side Imaging units only. WARNING: This product can expose you to chemicals including LEAD which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings. ca. gov. Specifications: Temperature: Yes Speed