those are sensors for measuring forehead temperature to detect visitors having a fever fever; part of the post SARS measures. http://www.info.gov.hk/info/sars/

those are sensors for measuring forehead temperature to detect visitors having a fever fever; part of the post SARS measures. http://www.info.gov.hk/info/sars/en/boundarycontrol.htm http://www.info.gov.hk/info/sars/en/boundarycontrol.htm having said that, the immigration department recently launched the opt-in self-check-in with facial recognition though