The clock with a built-in smoke alarm This fantastic Smoke Alarm Clock does not one, but two important jobs – perfect for the home or the office. This stylish contemporary clock does more than tell the time, it comes complete with an integrated smoke alarm too! Why have two appliances taking up space in your home or office space when one does the job just as well? Simply insert one AA battery to power the clock and one 9v battery to power the smoke alarm, affix the clock to the wall and you're simultaneously covered for smoke detection and keeping track of the time - Think about it: You'll know when this smoke alarm needs a new battery! Just be sure you don't use the Smoke Detector Clock to time your cigarette breaks though!