we found this 20-year-old smoke alarm in the home of patty frederick. >> we checked it every year to make sure that the batteries is over. i wasn't aware it could malfunction. >> reporter: after 10 years, the sensors in smoke alarms can start to fail. >> so if you have old smoke alarms in your house they may not work. >> reporter: you can find the age of your alarms by check the date they were manufactured on the back. experts recommend replacing old alarms with new smoke alarms that come with 10-year batteries. they will chirp when the unit needs to be replaced. >>> rockledge is prepared to take a tear way straight to a california courthouse. why they are being sued next. ,,,,,,,, ,,,,,,,,,, >>> well, today's tip of the day is going to be is late variety honeycrisp apples in the market. these late variety apples have been in cold storage and picked later in the season before they put them in the controlled atmospher rooms where it's 38 degrees suck out the oxygen and put the apples to sleep and they release them during the year. late variety are the big apple. look how big this is.