How many safety device or feature in m9 pistol?

The Beretta M9 pistol features several safety devices, including a manual safety/decocking lever, which allows the shooter to safely lower the hammer without firing, and a magazine disconnect safety that prevents the gun from firing when the magazine is removed. Additionally, it has a firing pin block that prevents the firing pin from moving forward unless the trigger is pulled. These features work together to enhance the overall safety of the firearm.