This heads up reflex optic combines our popular 4 reticle D4B with our new Patented KeyMod quick release mount. You can mount VD4BKM onto KeyMod handguards at an offset angle (30°/45°) for a secondary optic to your primary, for close range target acquisition and for moving targets. You can also mount the VD4BKM directly to the top KeyMod slots of our AK KeyMod Mount Receiver Cover (VMTAKKM). Selector switch at the back of the optic, allows you to select the desired reticle. RED colored four reticle set: Dot, Bullseye, Cross, and Bullseye. LED (Light Emitting Diode) 100% safe for the eyes. Unlimited eye relief for flexible mounting. 7 brightness settings for reticles. Black anodized aluminum construction.