The Saf-T-Round is a load indicator designed to prevent accidental discharge. If you see the orange round in your chamber, you know the chamber is clear. The round is ejectable, so you'll have immediate access to live rounds when you need it.
The new Short Tab Pistol Saf-T-Round, available in 9mm, .40 caliber, and .45 caliber, allows you to use Saf-T-Round technology on a holstered weapon.