The most complex attribute is the balance of verification methods and data capacity. Different models supply fingerprint templates, face templates, ID card capacity, and record storage. For example, MB20 offers 200 fingerprint templates, 500 ID cards, and 50,000 records; MB2000 increases to 3000 fingerprints, 2000 faces, 100,000 records, plus optional ID/Mifare. Connectivity varies (TCP/IP, RS232/485, USB-host). This combination affects scalability, network integration, and futureproofing. Choosing the right balance ensures smooth onboarding of staff and efficient attendance data management.