HID OMNIKEY 5321 Smart Card Reader/Writer - Smart Card - USB. The OMNIKEY 5321 is a dual interface PC-linked reader that reads/writes to both a 13.56 MHz contactless smart card and virtually any contact smart card. The dual interface feature economically supports end-user environments where both contactless and contact smart card technology may be in use. The reader supports contactless smart cards with up to 848kbps in the fastest ISO 14443 transmission mode.