Compact Dual, Side Imaging. 20/60/180 degree, 200/83/455 kHz with built-in temperature. 20' Cable. More secure, especially at high force of waves. Improved running angle and an optional lock down screw to override the kick up. Can be used with all HD SI modells of the humminbird series: 300, 500, 600, 700, Helix and 899. Mounting Hardware included.