Solar Fail-Safe Technology is an innovative feature integrated into STISA optics with solar power capability. Even if the battery fails, you still have a backup power source through natural or artificial light. This technology operates in automatic mode, adjusting the reticle brightness based on the amount of ambient light: brighter in strong light conditions and dimmer in low light, ensuring optimal visibility in all environments. Models equipped with a supercapacitor remain charged through this system, allowing the optics to operate continuously both day and night without the need for a battery. With its outstanding performance and innovative vibration wake-up feature, the STISA red dot sight is an ideal choice for shooting enthusiasts and professionals alike.