1) Type: contactless read and write 2) Meterial: PVC,ABS 3) rfid key chain makes your security control easier Color rfid key chain 1) Chip Compliance · ID Available at 125KHz nominal: EM4100, TK4100,etc.· IC Available at 13.56MHz nominal: Mifare 1k S50, Mifare 4K S70, SLE5542,SLE4442, Fudan series,etc.2) Physical Size: 3.2cm× 4.0cm, Thickness: 4.0mm 3) Standard Color: Blue or yellow, or others4) ...