Humminbird XNT-9-HW-MSI-150-T MEGA SI/DI Dual Spectrum CHIRP Transducer w/Temp f/HELIX 7/8 MEGA SI [710297-1]XNT 9 HW MSI 150 T MEGA SI DI Dual Spectrum CHIRP Transducer with Temp f HELIX 7 8 MEGA SI Transom Mount, MEGA Down Imaging, 455 kHz and 1. 2 MHz and Dual Spectrum CHIRP 2D Sonar with a CHIRP range of 150 220kHz. Includes built in temperature. Compatible with: HELIX 7 CHIRP MEGA SI GPS G3 G4, HELIX 7 CHIRP MEGA SI GPS G3N G4N. Features: Compatible with: HELIX 7 CHIRP MSI GPS G3, HELIX 7 CHIRP MSI GPS G3N, HELIX 7 CHIRP MSI GPS G4, HELIX 7 CHIRP MSI