Gadgets don't get any more simplerer and usefuler than the GeoSkeeper, a wrist cellphone that only has GSM/GPRS, a speakerphone, GPS, and six buttons, so the "elderly, chronically ill, children or lone workers" can instantly communicate in case of emergency.

That's all it does. The user calls pre-programmed numbers using the buttons, turns on the emergency alarm if necessary, and gets tracked using the GPS, even alerting when the user gets out of a certain area to whoever has the control. Available in[Aerotel via Engadget]