lieutenant anthony cusso is here from the fdny fire safety. it you for being here. >> and it you for having us. >> and you talk about the time change, too, remember to change the batteries in your smoke detectors and carbon monoxide detectors. talk about why it's important to do this? >> first of all, we gave away 30,000 batteries since thursday until yesterday. and today is probably a little bit more but it's important because we're finding about 95% of the homes have smoke alarms and a third of them do not have battery. it's important. and not only handing them out, but making people think it's time to change them. the lawed changed as of 2049 and that is a sealed alarm. this has the smoke and carbon monoxide. there is no battery to change. >> no. >> and what happens? how does it power? >> it's powered by a battery but a 10-year lithium. >> oh. >>> and it's sealed. when this alarm chirps, it's no good anymore. you throw it away. >> get a new alarm. >> right. >> and the one in the middle with the battery is fine. if you change the battery twi