This HumminbirdA(R) Transom Transducer is ready to bring CHIRP Down Imaging, Dual Spectrum CHIRP 2D Sonar, and temperature readings to your existing compatible Humminbird HELIX fishfinder. Includes cable and mounting hardware to make installation easy. Compatible with HELIX 5 CHIRP DI GPS G3 Dual Spectrum CHIRP 2D Sonar Down Imaging sonar with temperature measurement Transom mount 20 ft. of cableNote: This transducer does not support MEGA Down Imaging