This is the deluxe grip for the m645. It also fits the C330 and 645e (not the Super or Pro). It is a very useful accessory that adds a lot of usability to the camera. It lets you hold the camera and shoot comfortably and securely with one hand and makes the camera much easier to shoot in vertical position. The grip has a built in trigger and strap.
This one is in good condition with moderate wear and works perfectly.