The personal medical alarm is typically activated by a resident pressing a button on the alarm when they were feeling unwell. Using the mobile phone network, the device connects to the Rosie call centre and the wearer is then speaking to a live operator. The Rosie operator is trained to carry out a triage process and then provide the necessary help. This usually involves sending an ambulance to the wearers location.
The Rosie personal medical alarms are rechargeable and daily charging is recommended. This is achieved using a bedside cradle or clip on USB cable. Battery life varies between 1 to 3 days subject to location and usage.
Most personal medical alarms can identify their location through the use of GPS (Global Positioning System) by receiving satellite signals and communicating that location through to the Rosie call centre using the mobile phone network. This feature aids the ability for the Rosie operator to send help to the precise location.
The use of GPS also means that the wearer is not limited to just their home location and can travel anywhere with mobile phone and satellite coverage.
Most personal medical alarms include fall detection. Should the device detect that the wearer has had a heavy fall, it automatically activates a call to the Rosie 24-hour call centre in the same way as manually pressing the button. While a very valuable feature, it is technically difficult for these devices to distinguish between some normal activity and a fall. The nature of falls is also such that false alarms are inevitable, and some falls may not be recognised. Fall detection sensitivity can be adjusted remotely by the Rosie operator.