Medical alert pendants or bracelet for best medical alert systems are designed to work during power outages for up to 24 hours. Some problems occur when people follow the trend toward cable bundles. Normal land line phones have their own power but cable modems usually have only up to 4 hours back up or less. If your cable modem goes out so does your phone. Without a phone your medical alert system can’t call for help when you are in trouble in your home. We suggest the elderly be careful when switching to a cable bundled package. It will increase the risk of not getting the help you need during a power outage. Your medical alert bracelet or pendant will work regardless.