To be clear ERPNext by itself does not support any Bio-metric device directly… All ERPNext supports is the processing of IN/OUT logs (i.e. Employee Checkin DocType) to mark attendance. The part where you push the IN/OUT logs from your Biometric device to ERPNext is up to you. Having said that, there is a ready made script available that helps you push IN/OUT logs to ERPNext from most ZKTeco devices or any device that supports the ZKProtocol (most ESSL Devices). Here is a link of supported devices by that script: Link
Also, It would be appreciated if you do a basic google search and go through some existing questions before asking questions here.
Here is another thread that has the information you are looking for: