Do they have to decalre or pay any tax to bring with them a laptop computer, 1 camera and 2 cell phones?

my parents is planning a trip to china. They planning to bring with them a laptop computer, 1 camera and 2 cell phones. Do they have to decalre or pay any tax since the value will exceed 2000 rmb? They will bring those for personal use and take them back with them when they leave the country.