Cidron Combi is a reader operating on both 125kHz and 13.56MHz which makes it ideal to use where several card populations with different RFID-technologies and/or frequencies should be used at the same time. The Cidron Combi allows for controlled upgrading of legacy RFID-technologies utilizing 125kHz to a secure RFID technology such as MIFARE® DESFire® EV1 which operates on 13,56MHz and allows for AES128 encrypted communication between credential and reader. Cidron Combi supports reading of 13,56MHz technologies, for instance, MIFARE Classic®, MIFARE Plus® sector and MIFARE DESFire EV1 application combined with 125kHz technologies such as Electromarine (EM4200) and HID® Proximity compatible cards.