The EOTech 516 is the ideal all purpose optic for Law Enforcementapplications especially when partnered with an EOTech magnifier. This 516HWS operates on the same CR123 lithium batteries commonly utilized by theleading gear manufacturers. When it matters most, the combination of speed,versatility and extended battery life will make you an unstoppable force. SPECIFICATIONS:Mfg Item Num: 516A651 Magnification :1xObjective :1.20" x 0.85"Field of View :30 yds @ 4" Eye ReliefEye Relief :UnlimitedDOT Size :1 MOA DOTLength :5"Weight :11.9 ozFinish :BlackBattery :2 CR123 lithium