The Guardian Alert 911 system is a set - a base station which plugs into the phone jack - and a pendant which is worn by the user.
The system can operate anywhere in and around the home - with the base station plugged into a phone jack in the central part of the home.
The Pendant runs up to a year on a AAA alkaline battery (included). The pendant is splash resistant so it can even be taken into the shower. The Test Button on the bottom of the unit gives an audible confirmation of battery condition. Hold the Test Button in an extra few seconds - and you can confirm that the full system is working. No Monitoring Fees, Service Charges or Contracts ever.