Over 4 years of continuous use when used at 70ºF (21ºC) at setting 4 of 8. Extreme temperatures (high or low) will affect lithium battery performance. The item "Trijicon RMR RM06 3.25 MOA Adjustable LED Red Dot Sight type 1 700039 Authentic" is in sale since Sunday, April 21, 2019.This item is in the category "Sporting Goods\Hunting\Scopes, Optics & Lasers\Red Dot & Laser Scopes". The seller is "cowboydave157" and is located in Saint Paul, MN. This item can be shipped to United States.