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Micro-bead
From Warhammer 40k - Lexicanum
Micro-beads, or comm-beads, are short-range communication devices used by the Imperium that are worn in the user's ear. Their range is good out to about one kilometre, but such things as bad weather, dense terrain and intervening rock or plasteel can greatly reduce this range.[1]
Sources
- 1: Dark Heresy Core Rulebook, pg. 151