Eligible frequent visitors to Hong Kong, holding a valid electronic travel document designated by the Immigration Department of the HKSAR and who, at the time of enrolment, have visited the territory via the Hong Kong International Airport for no fewer than two times in the past 24 months, may use the ‘Go Hong Kong’ mobile application to enroll for the e‑Channel service prior to their arrival. After successful enrolment, they can use the e‑Channels for self‑service clearance upon arrival. 

For detailed information, please visit: https://www.immd.gov.hk/eng/services/echannel_visitors.html#fv