The PiranhaMAX 4 is also one of the newer models of the P-MAX series from Humminbird. It’s actually the unit which basically replaced the PiranhaMAX 197c which was discontinued. It’s not much different from the older unit, but does have a wider display.
The PiranhaMAX 4 DI is one of the newest fish finders from Humminbird for 2017. It's also one of the most affordable units that have Down Imaging. However, as the title suggests, this is NOT a combo unit. Thereby it does not have GPS, charts or any other navigation functions. It's a standalone fish finder.
Like most Humminbird fish finders, this PiranhaMAX 4 DI does come with a transducer. The box includes the XNT 9 DI T transducer, which is also temperature capable, as it integrates a temperature probe. This transducer comes with a transom mount.