When evaluating a Free Standing LED Screen (often called an LED Poster), the most critical factor is the Pixel Pitch (P); for indoor retail, P1.8 to P2.5 is standard, while P3 or higher is suitable for larger venues. You must also verify the Brightness levels, which should be at least 800-1200 nits for indoors and over 5000 nits for window-facing displays to ensure visibility against sunlight. Additionally, check the Refresh Rate, aiming for ≥3840Hz to prevent flickering on smartphone cameras, which is vital for social media marketing.