After repairing Generators for a total of 33 percent, Wiretap activates:

After repairing a Generator for 3 seconds, press the Active Ability button to install a Wiretap, which stays active for 60/70/80 seconds.
The Auras of trapped Generators are revealed to all Survivors in yellow.
When the Killer comes within 14 metres of a trapped Generator, their Aura is revealed to all Survivors.
Damaging the Generator destroys the Wiretap.

Once the Exit Gates are powered, No One Left Behind activates:

Increases your Unhooking and Healing speed by 30/40/50 percent.
Grants 50/75/100 percent bonus Bloodpoints for actions in the Altruism Category.
Grants the unhooked Survivor a 7 percent Haste Status Effect for 10 seconds.
The Auras of all other Survivors are revealed to you.

Unlocks potential in your Aura-reading ability.
When healing another Survivor from the Dying State to the Injured State, they are granted a 10 percent Haste Status Effect for 6/8/10 seconds and the Killer's Aura is revealed to the both of you for the same duration.

Upon completing a Healing action on another Survivor, they benefit from the following effect until the next time they take damage:

Increases their Action speeds in Healing, Unlocking, Cleansing, and Blessing by 12/14/16 percent.