ACR3901U-S1 Bluetooth&reg; Contact Card Reader Bluetooth Smart Interface USB-Powered (PC-linked mode): Supports ISO 7816 Class A, B, and C (5 V, 3 V, 1.8 V) cards Supports microprocessor cards with T=0 or T=1 protocol Supports memory cards Incorporates a Lithium-ion battery (rechargeable through PC-linked mode) CCID Compliance