Huginn

Huginn (フギン) is a type of drone used by the Faith Organization.

Etymology
is one of the ravens that fly around the world to gather information for Odin in Norse Mythology.

Principles
Huginn is a toy-like drone that uses six rotors to fly and a highly sensitive microphone to detect any manmade noise.

Background
Huginn and its counterpart Muninn were adopted by the Norn's unit after they were tricked by a strobe light tactic, causing them to abandon light-based sensors in favor of microphones.

The Three Sisters who Pull In a God of War
Part of the Norn's maintenance base's defenses while in Madagascar were several Huginn and their counterparts. The 37th used their directional speakers to mask their own sounds to trick them and infiltrate the base.