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RFID fob 125khz EM4100 TK4100 EM Marine ABS waterproof Key Tag - 10pcs | eBay
100pcs Blue Rfid 125 Khz Em4100 Key Tag Keyfobs Ring Chip Keytab Tk4100 Tags 125khz Read Only - Ic/id Card - AliExpress
Amazon.com: 125khz RFID Card Copier Duplicator Handheld RFID Reader for Door Access Control +8pcs T5577 Key Fob Tags + 2pcs Regular EM4100 Wristband + 4pcs T5577 RFID Cards : Electronics