The Taurus family of semi-auto pistols feature the Taurus Security System, which provides instant-ready defense with built-in ability to secure your pistol and make it inoperable at the turn of a key. When the Security System is engaged, the pistol cannot be fired or cocked and the gun's manual safety cannot be disengaged. As with our revolver Security System, the device is part of the firearm and cannot be lost, and the same special Security Key works for both the revolver and pistol Systems. To engage: simply insert the Key into the button on the rear or side of the pistol and rotate one-quarter turn clockwise. This engages the Security System. The manual safety cannot be moved and the trigger cannot be pulled. To disengage: simply rotate the key one-quarter turn back. This releases the Security System, yet leaves the pistol's manual safety in the "safe" position until you are ready to release it yourself and fire the gun. Initially, the Taurus Security System was first offered on Taurus revolvers. Taurus now incorporates the system on its pistols and rifles.