Holosun machined this product from light yet rugged 7075 T6 aluminum and added a multicoated lens that provides a bright, crisp sight picture. The Holosun 407K X2 Green Dot Sight uses a high capacity lithium battery to power the optic, ensuring you'll always have a reliable point of aim in the field. These optics are designed with Shake Awake technology that senses motion to power the sight on and off, and last setting recall ensures you don't lose your customized options once the unit powers down.
This model offers up to 50,000 hours of battery life with bright and crisp 6MOA dot only reticle. Enhance your shooting skills and create a better experience at the range by equipping your pocket pistol with a Holosun HS407K X2 Green Dot Sight. Objective Window Size: 0.58 x 0.77 in. Lens Material: Multilayer Reflective Glass. Operating Temperature: -30 - 60 Celsius.
What that means is if you order. It depends on where you live.