Are you getting the read range you want from your mullion style card reader? If not, it's likely your card reader has contact or close proximity to metal... which causes the interference. This buffer plate is designed to help. It improves the reader's range by separating your RF reader a full inch away from the metal surface and provides a High Density Polyethelene (HDPE) insulator.
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This product has been designed to work specifically with the following products: