Molded glass aspheric lens with high-performance coatings for superior light transmittance and zero distortion; 3 MOA red dot with multiple brightness settings for rapid target engagement under a full range of lighting conditions; TruHold Lockless Zeroing System that utilizes twin adjustment springs designed to endure handgun recoil and return to zero shot after shot; Point-source emitter provides exceptional brightness with 12 settings (10 Daytime/2 NV), and 20,000+ hours of runtime; MOTAC (Motion Activated Illumination System) that powers up when it senses motion and powers down when it does not; Aircraft grade CNC Aluminum housing ensures a lifetime of reliable service; Dependable waterproof (IPX-7 rated for complete water immersion up to 1 meter) and fog proof performance; Ruggedized protective steel shroud included for extreme durability; Easy access battery compartment; Sig Sauer Electro-Optics Infinite Guarantee and Sig Sauer Electronic Component Limited 5-Year Warranty