USA Medical Monitoring Service provides the most powerful two-way communication medical alert response device on today's market. LIFE CONTROL is a miniature walkie-talkie unit that can be worn around the neck, on the wrist, or clipped to your waistband. It works anywhere in your home as well as in the backyard, the garden or down the driveway to the mailbox...a full 600 feet (that's 2 football fields!) away from the base station. We are certified by the American Emergency Monitoring Association with trained personnel who will call EMS, fire, police and the family and friends on your call list.