Requires electricity to run. Consumes bullets while firing. Can be configured to automatically attack hostiles within range.
— In-game Description

The Auto Turret or Automated Turret is a type of automated weapon in ARK. The Auto Turret fires the Advanced Rifle Bullet and must be powered in order to function. This turret, the Minigun Turret, and the Assault Rifle are the only weapons to use this type of ammunition. The Automated Turret is good for base defense with it doing 100 damage a bullet and 400 damage a bullet to airborne creatures. It has settings on the turret were you can give it a delay/range for intruders. The short range function is only about half a Brontosaurus out.

Video Demonstration

This video will demonstrate the auto-turret please keep in mind this was before some of the updates to increase its tracking speed.

Auto Turret -ARK Survival Evolved-

Auto Turret -ARK Survival Evolved-