1. IP65 waterproof standard; 2. Build in IR indicator and low battery indicator; 3. Optical distortion less than 0.5%; 4. Mil-spec multi-coated optics; 5. 30mm diameter eyepeice lens; 6. Longer eye relief 25-40mm with full FOV; 7. Normal use CR123A battery, also offer AA battery version; 8. AUTO shut OFF/ON when flip up/down, save power when not use; 9. Eyepiece lens and objective lens coated with demist coating; 10. Strong light auto shut off;