Originally Posted by
dsgtc0408
It's much smaller than that, and in any case is irrelevant. HK Immigration attaches the barcode to the outside back cover of your passport parallel to the spine to the left. Call it three Forever (US Post Office) stamps across, about three inches wide, 3/4" tall. You therefore insert the passport closed, barcode face down on the reader glass of the e-channel machine.
I renewed my echannel last oct and only have a e-channel service enrolled sticker on the outside of my passport. I passed thru the echannels using the information page of my passport. No problem