These limited - edition watches will be available from 5 december 1999 at mtr and airport express customer service centres , kcr - east rail and kcr - light rail customer service centres , 7 - eleven convenience stores ( except those at mtr and airport express stations ) and branches of dah sing bank , while stock lasts . the precision quartz , battery - operated timepiece is water - proof and shock - proof . with more than 5 . 8 million cards in circulation , the octopus is recognized as the most popular contactless smart card in the world 限量发行的八达通千禧手表备有五个款式供选择，配合不同品味，将于一九九九年十二月五日起在地铁及机场快线客务中心、九广东铁及九广轻铁客务中心、七十一便利店（位于地铁及机场快站的七十一除外）及大新银行各分行公开发售，售完即止。
