Prove your Faraday bag actually works. Flipper Zero app that measures how much a signal-blocking pouch really attenuates your car key fob (real dB on Sub-GHz) and your contactless cards (13.56 MHz NFC), then grades it A+ to F — the pouch that is supposed to stop a relay attack, tested. No extra hardware, never transmits.
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Updated
Sep 26, 2026 - C