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Note: 1. The standard battery of the computer may be insufficient after various tests. If you wish, buy a few more batteries as a spare: http://detail.tmall.com/item.htm?id=44146232889 . 2. In order to prevent the screen from being scratched, the stopwatch is shipped with a film, just tear it apart. Computer code table (3 yuan 5 pieces), new English version of wireless code table,