Please note that our partnered third-party laboratories can only conduct tests up to 40GHz due to not having higher spectrum testers. However, the results demonstrate an impressive 99% blocking efficacy for most of our products at this frequency. The lower frequency end of the chart also represents the frequency range the test was conducted under. Our fabrics can theoretically block higher and lower frequencies than what’s shown on the chart. The range on the chart simply represents the limits of the testing conditions.