and highlight some of our challenges that we have when we do share information about if we're undercommunicating or overcommunicating or using the right system. first, a quick overview of what systems we have in place in san francisco. our primary one is alert sf. the biggest thing i think to know about alert sf,it's completely opted in. this relies upon the preparedness campaign and us going out to the public and encouraging them to sign up. so it's very simple to do. this is probably the biggest thing you can do to help us to make sure people are aware of incidents in their neighborhoods. it's very simple to do. you just text 888-777 and then in the body of that text you put in alert sf one word and we'll have the graphic up at the end of the presentation. but just to give you an idea of the reach in san francisco, we have about 90,000 users. so this is what our duty officers used to communicate with the public and this isn't something that our duty officers do just on their own accord, this is usually the fire department is on the scene or they're responding to a call after dispatch alerts th