The unit's precision lenses are polished to "exacting geometries to virtually eliminate parallax and to provide a very clear crisp sight picture," according to Burris.
Also, the unit is fully windage and elevation adjustable and lockable. It features both an on/off switch and a light sensor that automatically adjusts the dot's brightness to the available light. The included plastic hood covers the light sensor and puts the unit in sleep mode when the on/off switch is set to "on."
FastFire is powered by a lithium CR2032 battery, which is commonly available and long lasting because of the highly efficient electronics and a battery-saver mode. A battery can last as long as five years.
The Picatinny mount allows mounting on just about any rifle. Special bases are available for the most common firearms.
The unit is waterproof, according to the company's product description.