While registering the face, it captures the relative face position, size and shape of your eyes, nose, cheekbones and jaw features. So even sometimes if you wear the spectacles & get fat, its system doesn’t get affected. The system can perfectly match & verify the employee.
Primarily your face & fingerprint can be registered to the machine. You need to stand & look in-front of the built-in camera.
It is more ideal for chemical & construction industries where the fingerprint system may have some concerns. And industries where the hygiene is more important then it will be more ideal being it is touch less.