... communication link by7) Multi-card-operating supporting: anti-collision, dynamic read + write, fast anti-collision protocolMifare 4K CardFeatures:1) Operating frequency: 13 ... : label, ticket, card, glass bead, integrated, wristband, button, keychain tag2) Read / write card3) Chips: Mifare S50, Mifare S70, Mifare Utralight, Mifare Desfire ...