The Sig Sauer ROMEO1PRO Reflex Sight is a no nonsense compact and combat-ready red dot sight designed for use with handguns. The ROMEO1PRO features Sig's MOTAC (Motion Activated Illumination System) that activates red dot illumination when motion is detected and deactivates dot illumination when motion ceases - allowing for up to 20,000 hours of runtime per battery. With an upgraded emitter forsuperior brightness, the ROMEO1PRO is capable of mounting to any SIG pistol or any other pistol machined to accept the ROMEO2 / PRO reflex sight interface and mounting hole spacing using the included M4 mounting screws. The ROMEO1PRO features Sig's TruHold Lockless Zeroing System that utilizes twin adjustment springs and ensures return to zero shot after shot. Features of the Sig Sauer ROMEO1PRO Reflex SightMolded Glass Aspheric LensHigh Performance Lens CoatingsMultiple Brightness SettingsTruHold Lockless Zeroing SystemMOTAC (Motion Activated Illumination System)CNC Machined Aluminum HousingRugged Protective Steel Shroud Included Sig Sauer ROMEO1PRO 3 MOA 1.0 MOA Adjust Steel Shroud Reflex Sight SOR1P100