Sundial's clocks are capable of reading RFID cards for verification and punching.
They can be purchased from us or you can find them anywhere online. Look for the following keywords:
EM4100 / EM4101 / TK4100 with a 125Mhz frequency at 64bit pattern
Here is a search result on Amazon.com:
https://www.amazon.com/s?k=rfid+card+EM4100+EM4101+TK4100+125Mhz+64bit+pattern