Humminbird XNT-9-HW-T HELIX Dual Spectrum CHIRP Transom Mount Transducer w/Temp [710274-1]XNT 9 HW T HELIX Dual Spectrum CHIRP Transom Mount Transducer with Temp Transom Mount Dual Spectrum CHIRP Transducer supports Dual Spectrum CHIRP 2D Sonar with high frequency beam and wide cone angle, offering CHIRP range of 150 220kHz and max depth of 1200ft. Includes built in temperature sensor, rugged composite design, impact release mounting bracket and 20' cable. Features: This accessory is compatible with the following Humminbird products: HELIX