Dual Spectrum CHIRP frequencies: Full: 150-220 kHz, Narrow: 180-240 kHz, Wide: 140-200 kHz. Dual Spectrum CHIRP max. depth: 1,200′. MEGA Side Imaging+ frequencies – max. range (side-to-side): 455kHz: 440-500 kHz – 800′, 800kHz: 790-850 kHz – 250′, MEGA SI+: 1075-1150 kHz – 400′. MEGA Down Imaging+ frequencies – max. depth: 455kHz: 440-500 kHz – 400′, 800kHz: 790-850 kHz – 125′, MEGA DI+: 1075-1150 kHz – 200′. Includes built-in temperature sensor, all metal bracket and 20′ cable. For use with: HELIX 8 MSI GPS G3N/G4N, HELIX 9 MSI GPS G3N/G4N, HELIX 10 MSI GPS G3N/G4N, HELIX 12 MSI GPS G3N/G4N, HELIX 15 MSI GPS G4N.