Wall or Fixture Mounted General Area Emergency Signaling System. Indoor and Outdoor Installation. NEMA 3R Rated. For Use With Eye or Eye/Face Wash Units. Double Pole Double Throw (DPDT) Flow Switch in Brass Construction, 1/2″ NPT Supply. Remote Location Hookup Possible via Contacts in Flow Switch or On Control Board. Automatic, Audible, and Visual Alarm. Minimum 2.4 GPM Flow Required. 6 Foot Cord. Universal Voltage: 90-264 AC, 50-60 Hz. Amber Signal Light and Piezo Fast Beep Horn Sound Activate When Fixture is Used. Central Control Board Powers All Options and Runs on Safe 24 V System. UL Listed.