The 515GT is a compact 20mm micro optic packed with innovations. Featuring Holosun's Multi-reticle system" the 515GT allows the operator to switch from a 2 MOA dot to a 65 MOA circle dot with a push of a button. Holosun's highly efficient light emitting diodes allow the 515GT optic to run on a CR2032 battery up to 5-years. The 515GT is housed in CNC machined Titanium and comes with removable" non-obstructing" clear flip-up lens covers and kill flash. Holosun's Shake Awake technology puts the optic to sleep with no motion and wakes it up" recalling the last setting with the slightest movement" conserving battery life even further. The HE515GT is built for all your needs no matter the weapon platform" environment" or type of use.