I have 2 SureFire Titan T1A lights, both are used, one significantly more than the other. The less used one works perfectly, the more used one is kind of quirky, and could use a warranty trip back to SureFire to sort it out. It kind works intermittently. And as such is priced appropriately. This light is a continuously variable twist light, runs on 1x CR123A (Not included) Both have a single split ring attached, but no lanyard.