Designed and engineered with the help of Ralph and Vicki Cianciarulo of Archer's Choice for real-world bowhunting applications. Large ocular lens results in a 21% wider field of view so you can locate targets quickly and range them faster. Displayed range compensates for shot angles to 89° up or down. Accurate to 1/10 yd./meter to 100 yd./meters. Active brightness control viewfinder automatically adjusts display and reticle to target color for optimal readability. Waterproof and fogproof optics. Easy single-button operation.