7-11 opened a special site for the headphones' campaign.
There will be a lottery too from November 2nd to January 8th. You have to buy headphones, you'll find a scratchcard inside. Then you must collect the words "我" "愛" "招" "財" "貓" in order to get the prizes. You can win Cold Stone coupons too.
A promo pic posted by 7-11's Weibo:
Jolin introduces the headphones (is it me or does she look tired in this video?)