Surefire
Helmet light
HL1-A-BK
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HL1-A-BK features three white LEDs, two blue LEDs, and one blinking infrared LED that serves as a personal Identify Friend or Foe (IFF) beacon
Read more here:
http://www.policeequipmentdealer.com/Document/PED/SureFire/HelmetLight_PIS.pdf
