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 for superior 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 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 Sight.MOTAC (Motion Activated Illumination System). Rugged Protective Steel Shroud Included. What that means is if you order. It depends on where you live.