The Humminbird XTM 9 20 T trolling motor mounted transducer is designed to mount to the body of most trolling motors, and is constructed with a low profile shape that reduces drag in the water and minimizes the possibility of hang-ups in weeds. This unit is a dual beam trolling motor hydrodynamic transducer with 20 degree and 60 degree tapered angle beams, with operating frequencies of 200 kiloHertz and 83 kiloHertz respectively. The XTM 9 20 T has a built-in temperature sensor and is compatible with Humminbird's; Piranha 5, Legend ID40, Matrix 15, Matrix 17, Matrix 25, Matrix 27, Matrix 55, Matrix 65, Matrix 67, FF515, FF535 and FF565 sonar or fish finder systems. Designed to mount on the body of most trolling motorsConstructed with a low-profile shape that reduces drag in the water and minimizes the possibility of hanging up in weeds.Built-in temperature sensor