See the Galaxy They Say - Should Have Joined the Navy
Power Armour Auto-senses
Auto-senses: The Space Marine gains the Dark Sight Trait, and Heightened Senses (+10 to relevant Tests) for Sight and Sound. Input filtering provides immunity to photon flash grenades and stun grenades.
Note that these benefits only apply whilst the Space Marine is wearing his helmet, and the benefits from the Auto-senses stack with the benefits of the Space Marine’s Lyman’s Ear and Occulobe implants (meaning that Space Marines have a +20 to Sight- and Sound-based Awareness Tests). Additionally, the Auto-Senses make the Called Shot Action (see page 238) into a Half Action.