http://www.zephyr-technology.com/first-responder-system.html

Designed for squads of people deployed in the harshest environments, the Zephyrâ„¢ PSM Responder enables the monitoring of multiple individuals and teams simultaneously. The Zephyrâ„¢ PSM Responder is for Fire Fighter teams, HAZMAT, WMD CBRN, or any teams that deploy into potentially hazardous, challenging environments...