The Latest Medical Alert System Technology at Work MXD The MXD Medical Alert System is Rescue Alert’s newest model, and contains the latest technology. The first in the industry to be completely VoIP and Cable Compatible and traditional telephone system compatible, this sleek and attractive medical alert was designed by Rescue Alert engineers with your protection and comfort in mind. The MXD is the centerpiece of your medical alert system. The extremely powerful unit offers increased speed, accuracy and durability when it comes to monitoring. As always with Rescue Alert, this unit’s excellent microphone and speaker provide sound quality and clear Two-Way Voice communication between your home and the Response Center to help you hear and be heard during an emergency.