Not sure if there are multiple models. The ones I saw had a gate (red/green, i.e. 'you can come in now' lights), and had you to put your hand down in a designated area / look into a camera.
Since I wasn't exactly able to move over and inspect the device from up close I admit that I just _assume_ that the hand thingy compares your fingerprints - I wouldn't know what else it could look at otherwise. Maybe it's just a bible and you have to solemnly swear not to be a terrorist, on camera. Looked weird from 10m away, everyone putting down their (right?) hand on the device, looking into the camera and waiting for the machine to say 'You are good to go'.
I don't plan to visit the US, ever. Personally I can easily state that I my desire to see some (probably) cool places over there isn't high enough to put up with the BS, professionally I am able to dodge any and all suggestions to go there so far - and will try to keep it that way (but that's the loophole: I won't sit on my hands and flat out refuse if my company forces me to go there. I will complain loudly and make sure that my unwillingness to go is heard though).
Since I wasn't exactly able to move over and inspect the device from up close I admit that I just _assume_ that the hand thingy compares your fingerprints - I wouldn't know what else it could look at otherwise. Maybe it's just a bible and you have to solemnly swear not to be a terrorist, on camera. Looked weird from 10m away, everyone putting down their (right?) hand on the device, looking into the camera and waiting for the machine to say 'You are good to go'.
I don't plan to visit the US, ever. Personally I can easily state that I my desire to see some (probably) cool places over there isn't high enough to put up with the BS, professionally I am able to dodge any and all suggestions to go there so far - and will try to keep it that way (but that's the loophole: I won't sit on my hands and flat out refuse if my company forces me to go there. I will complain loudly and make sure that my unwillingness to go is heard though).