Humminbird XNT-9-20-T TM Transducer - 83/200 kHz [710198-1]Transom Mount Transducers Transom Transducers mount on the transom (back) of the boat in contact with the surface of the water. To prevent damage to the boat or transducer. Transom mount hardware is included with the transducer. Description: New transom mount transducer design. Single Dual Beam, 20 60 Degree, 200 83 kHz with built in temperature sensor. New design is more secure and is not a prone to kick up at high force of waves. It has an improved