This is a used P66 and was on my Garmin depth sounder, it still works well. It comes with all the parts shown and is the version that does not have the paddle wheel for speed. 

The P66 is the best performing and most popular, transom mount, triducer multisensor in the market for many reasons. Foremost, the 50 kHz and 200 kHz, oversized, ceramic element produces focused beams, highlighting detail in the water column and in the bottom structure.

Setting the Industry Standard

Because of its hydrodynamic shape, water coming off the transom flows smoothly under the transducer face. This results in accurate, high-speed, depth readings and clear display images. Going a step further, the P66 triducer multisensor also incorporates a noise-suppression system. The result is a 5 to 8 knot (6 to 9 MPH) improvement over standard construction through improved shielding from noise and vibration. And the plastic release bracket lets the P66 rotate up to protect the housing if struck from the front.

Fishing Applications

Lake and inshore all-around saltwater fishing for small to mid-size outboard boats.

Features:

Depth and temperature in one housing

Plastic kick-up bracket

Transducer can be removed from bracket without the use of tools for easy service and storage

Boat Size: Up to 12M (40')