This is the Holosun HS407K X2 6 MOA red dot open reflex sight.

HE407K X2 is packed with Holosun innovations:

• Shake Awake
• Super LED with up to 50k hour battery life
• Multilayer Reflective Glass
• 12 Brightness settings: 10 daylight options and 2 night-vision compatible options
• Parallax-free & unlimited eye relief

Comes with the following:

• User Manual
• Lens Cloth
• CR1632 battery