"Orange whistles are garish and weapons can easily be turned against you. Attackers rarely strike indiscriminately; they look for an easy target. A woman who projects confidence and direction is less likely to be targeted. The Subtle Safety Ring provides an at hand reminder for the wearer to consider her personal safely and make choices that will avoid dangerous situations."The weight of the 1911 on my belt is a handy reminder to keep me out of dangerous situations, because nobody wants to be put in a position where she has to shoot somebody. Even under the most righteous of circumstances, it would be a colossal pain in the ass.
My real beef with a lot of these personal protection gimmicks is that they require the user to get within touching distance of an attacker. Most also require some level of physical aptitude to use properly. If you're 5'2" and have never been involved in anything more violent than a dodge-ball game, a trinket like this ring is worse than useless, especially if it instills a false sense of confidence. Get a can of name-brand OC, like Freeze or Punch. Get an extremely bright (60+ lumens) flashlight. Get some training. Get aware. Don't get taken.