Humminbird 710270-1 XTM 9 MDI T Trolling Motor Transducer. Digital CHIRP Dual Spectrum 2D and Digital CHIRP MEGA Down Imaging; Dual Spectrum 2D CHIRP with 25° and 42° coverage @ -10dB; 455/800/MEGA MEGA DI CHIRP with 45° and 75° @ -10dB. Trolling motor mounted. Only compatible with MEGA DI HELIX models.