The TM150M is a transom-mounted CHIRP transducer, ideal for sportfishing and commercial vessels up to 25ft in length. This single-channel transducer offers Medium CHIRP for a balance between the great depth penetration of Low CHIRP, and the superior target resolution of High CHIRP.
Used one season
Link to product info.https://www.lowrance.com/lowrance/type/sonar-transducers/xsonic-airmar-tm150m/
125.00 + shipping