This XM9 transducer from Humminbird is designed to be mounted onto the transom and features a built-in temperature sensor.

Compatible with the following Humminbird models:
HELIX 8 G3N/G4N Series MEGA DI+, HELIX 9 G3N/G4N Series MEGA DI+, HELIX 10 G3N/G4N Series MEGA DI+, HELIX 12 G3N/G4N Series MEGA DI+, HELIX 15 G3N/G4N Series MEGA DI+

Specifications:
Cable Length: 20ft.
Dual Spectrum CHIRP Frequencies: Full: 150-220 kHz, Narrow: 180-240 kHz, Wide: 140-200 kHz.
Dual Spectrum CHIRP Max Depth: 1200ft (365m).
Down Imaging Frequencies - Max Depth: 455kHz: 440-500 kHz - 400ft (122m), 800kHz: 790-850 kHz - 125ft (38m), MEGA DI+: 1075-1150 kHz - 200ft (61m).