Features: This RFIDs field strength detection card combines precise frequency testing with keychain design, enabling accurate signals assessment for door access systems and security management applications. Featuring high sensitivity sensors, it supports UHF and HFs detection across 125KHz to 13.56MHz frequencies, with LED indicators for real time signals strength feedbacks and a waterproof, wear resistant plastic construction. for RFIDs systems developers, engineers, technicians, and everyday users involved in access controls setups and routine maintenance tasks. Perfect for troubleshooting and optimizing security in high demands setting such as campuses, office buildings, factories, and other areas requiring door access reader functionality. Its compact, lightweight keychain form ensures effortless portability and 1touches operations, making it dependable tool for quick on site diagnostics and systems verification. Specifications: Type: RFIDs field strength detection card Materials: Plastic Frequency: 125KHz to 13.56MHz Size: 5.3x3cm Package Includes: 1PC Field Strength Detection Card note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the Pictures may not reflect the actual of the item.