"Four selectable frequencies" is the key benefit of this sounder. This innovative sounder is equipped with the capability of selecting four frequencies within the range of broadband transducer (two types available: TDM-052 38kHz to 75kHz / 130kHz to 210kHz and TDM-062 38kHz to 75kHz / 85kHz to 135kHz). This feature provides its user with the possibility of fine tuning for spotting desired types of fish, improved search of water depth. Flexible selection of frequencies by 0.1kHz step enables the user to stay away from interference with the sounders on the other vessels.