. >> my name is fernando juarez, and i'm a fire captain with the san francisco fire department.have a hire extinguisher training system. you want to pull the pin, stand at least 8 feet away, aim it at the base. if you're too close, the conical laser that comes out, it's too small, and the fire won't go out on the screen. if you step back, the conical shape on the screen is bigger, and it will take the fire go out faster. so it can tell when you're too close. >> my name is alicia wu, and i'm the director of a san francisco based nonprofit. since 2015, we go out to the public, to the community and provide training in different topics. today we're doing c.p.r., controlling external feeding and how to do perfect communications in each topic, and also, i hope that they can bring it home and start gathering all the supplies for themselves to. >> on any given day in san francisco, we're very well resourced in terms of public safety professionals, but we all know in the event of a large scale disaster, it will be hours and days before the public safety professionals can get to you, so w