GreatCall is a San Diego-based company that sells mobile medical alert systems.  medical alert systems for seniors Its devices are small and portable, and they work across the country using cellular service instead of landlines.Founded in 2006, GreatCall has become the leading provider of connected health for active seniors. Its products include the Jitterbug Smart2 smartphone, a mobile personal emergency response system with an option for Urgent Care and MedCoach, and the Lively Wearable2, which combines a wearable help button with GreatCall Link, a smartphone app.Lively Wearable2 - $19.99 (free shipping) with one-year trial subscriptionGreatCall also offers the Splash device, which is a personal medical alert that uses GPS technology to connect with U.S.-based 5Star responders. The device can survive up to 30 minutes in 3 feet of water and has a large button that can summon help with the press of a button.It also comes with a one-year warranty and a product replacement plan. Should the device break or get lost, GreatCall will replace it free of charge.The Jitterbug Flip is a simple, easy-to-use phone that has a special ring tone for emergencies and can be used by people with hearing impairments. It also includes a live operator, who can help you call numbers and find addresses in the United States and Canada. Personal medical alarms It has a built-in nurse line, called Urgent Care, that lets you speak with a medical professional for advice on common health issues.  tracker for dementia patients You can also access MedCoach, which helps you manage medications by reminding you to take them every day. The Flip's 5Star service is also useful for seniors who have health conditions or who are at risk of falling, because it can contact emergency services if you're in an accident and don't know how to call for help.