Tried 4 out of 10 so far, it worked first time (just wrote/tested LF T5577, I can see HF but haven't tried to write to it) EDIT this review for 13.56Mhz LIBO Dual Frequency Composite RFID Cards 1K UID & T5577 125kHz ID Keyfob Readable Writable Rewritable for Copy Cloning Backup (10-Pack) Purchased Only 15. April 2021. As of May 13, 2021 , this review is attached to the reader/writer and tags. I do not have this read/write function.
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