Beretta PX4 D-TYPE 40SW 4" barrel 14 Rnds - $413 shipped

Beretta PX4 images from vendors are often incorrect. The PX4 comes in four "Types" and all are hammer fired.

Two "Types" have noticible slide mounted Decocker (DA/SA) levers - The Type F, and the Type G. They look similar externally. The hammer is also visible.
Both are Double Action then SIngle Action mechanism. (DA/SA) This means the trigger pull is heavier on the uncocked first shot. Both can be manually cocked and used as single action.
Type F = Combo Decocker plus Trigger Disconnect Safety - the most common variant. Safety must be OFF to enable firing.
Type G = Decocker Only - No Safety. Actuating the spring-tensioned Decocker Lever lowers the hammer, can then be fired as Double Action.

Two "Types" DO NOT have a slide mounted Decocker - The Type C and Type D. These also look similar externally, due to the smooth slide and hidden bobbed hammer. The hammer state is either always partially cocked (Type C - Constant Action - light weight DA only) or always dropped (Type D - heavy DA only). The hammer cannot be directly thumb-cocked by the operator.
Type C = Partial/Half Cock - near Single Action only - hammer is partially cocked by slide action, similar to a Striker Fired action.
Each trigger pull completes cocking and releases hammer.
Type D = Double Action Only - each trigger pull cocks and releases hammer.