Designed for fire fighters and haz-mat incident responders, PSS Merlin Telemetry System monitor exact status of up to 12 team members simultaneously from outside the incident. Includes an entry control display board, a DragerMan Sentinel II device, and a portable remote entry module (REM) attached to fire fighters SCUBA. Provides continuous transmission of cylinder pressure, time-to-warning whistle, and temperature. Separate lamps on control board differentiates ADSU (PASS) alarm signal and manual distress signal. Voluntary withdrawal facility supports group and individual evacuation commands. Board runs on 2 rechargeable nickel metal hydride batteries. Accommodates post-incident data logging.