*The GT10 Red Dot automatically turns on when it is moved and will auto shut off if not moved for 1-3mins*The T10 is a one-piece Aluminum construction that is Fog Proof, Shock proof, Water proof up to 3 meters.*1 CR2032 battery will last up to 50,000 hours of use with a crisp 3 MOA Red Dot with 10 brightness settings for visibility in all light conditions.3 MOA Shake Awake Rifle Scope with Absolute Co Witness Riser