Total Number of Employees to be registered on Terminal.
If Multi location how many employees to be registered on each Terminal
Time take to register per Employee for Biometric is normally < 2 Sec hence you need to plan number of Terminal to be purchased as per thumb rule see below
1 Emp. Authentication = 2 Sec / In 1 Min = 30 Emp. Authentication
10 Minutes = 300 Emp. Authentication
1000 Employees = 4 Terminal are required if you want to clear in 10 Min Max. (It will change as per company policy)
Select the Right OEM which has got history of Supporting forward and Backward integration of their own products i.e. it should support older Models along with Newer ones which will save Resource, Time & Cost.
Discuss current challenges so that you can get right advice from the OEM suiting your company requirements.