... coil connected to the chip serves as the IC’s power supply and bi-directional communication interface. The antenna ... MF1 S50, MIFARE 4K S70 / MF1 S70MIFARE PLUS S 2K, MIFARE PLUS S 4K, MIFARE S20MIFARE ULTRALIGHT, MIFARE ULTRALIGHT CMIFARE DESFire, ... for testing! Shenzhen YongKaida Technology Co.,Ltd www.szykdcard.com www.szykdcard.en.alibaba.com Ms. Keira Lee Trademanager:cn1000978671 Mobile phone:+ ...