Jillian Pikora As daylight saving time begins and the Susquehanna Valley has a National Weather Service Fire Weather Watch going into effect Sunday, firefighters want to remind you to check your smoke detectors. You may need to change the batteries in your smoke detector or replace it entirely. Fire departments suggest you check that your smoke detectors are working properly every six months by using the test button. If the battery is dead, replace it, but if it is not working do not wait to replace the detector. Newer smoke detectors have panels on them to prevent tampering. This means no one can easily remove the batteries; instead, the entire device will have an expiration date.There are three types of smoke detectors for home use:Smoke detection.High flame, fast moving fire detection.Rise in temperature detection.All types of smoke detectors have trigger alarm that sound to awaken you if fire starts while you are asleep. Whole house smoke detectors are also available but proper placement is important. Information on where to place smoke alarms in the home is available on the U.S. Fire Administration website. WGAL News 8's Amber Gerard spoke with firefighters in York about smoke detectors. You can find out more about what she learned by playing the video in the video player above.