MSA’s new M7 I-HUD Receiver for FireHawk® M7 Air Masks is worn on the inside of the facepiece, with 40 percent weight reduction compared to MSA’s external HUD. New LED light patterns enhance safety and security; unit syncs with SCBA upon startup and withstands brief water splash and submersion. Easy to install and remove. MSA,, (800) MSA-2222. products