If you are intending to select a good provider who will bring up the medical alert systems for you, there are certain issues that need to be addressed on priority basis. Many providers would propose that there is no necessity of any long term contract. They will suggest a minimum three months service period. Such advance pre-payment necessities may be a pointer that the provider is not worthy of your trust. 

Do not be carried away by the low price offer trap laid by unscrupulous merchants.  Reputed dealers cannot provide you a medical alert system below the approved market rate but quality and good service will be ensured. You need not be swayed away by the endorsement of products by some celebrity as they are paid for with your money. 

A good medical alarm system will always allow you a minimum of 30-days money back trial. Financial risks are minimized with such offers. It would also be better to select a provider who has his own indigenous monitoring system and has not outsourced the same. Outsourcing means that the provider does not have expert supervisory staff to oversee and regulate the functioning of their products. 

Finally, and this is most important, you should try to get testimonials from real customers. It would be even better if such customer of medical alarms hails from your neighborhood.