1) The document is a quick start user guide for the BLACKZONE Z-750 controller for Xbox One, which describes various rapid fire and aim assist modes that can be activated by pressing the left D-pad in combination with other buttons.
2) The modes include rapid fire, which increases rate of fire for all weapons; auto-aim, which locks onto targets while firing; quick scope for sniping; quick scope burst for sniper multi-shots; dual wield rapid fire for akimbo weapons; and drop shot, which causes the player to drop to the ground while firing.
3) Modes are turned on and off by pressing left or right trigger along with pressing the left D-pad a