It takes a good mind to accurately shoot incredible distances. When you take this feature your Intelligence ability score is increased by +3 to maximum of 24. Additionally, you may now ignore distance when taking shots with a sniper rifle. When your target is within one mile of you make your attack as normal. Beyond one mile, attacks are made with disadvantage.
Attacks made with your sniper rifle ignore half cover and less. Additionally, as long as you know the location of your target you do not need to see them in order to target them for an attack. For example, you may shoot through tinted windows, fabric, crowds of people, or thin structures such as civilian cars or portable toilets.