Good day! I will be attending a the Electronics Asia 2009 in Hongkong from October 13-16. On the side, I intend to meet several suppliers in Shenzhen. While I will be spending most of my time at the HK Convention Center, I plan to stay at a hotel in Shenzhen to meet suppliers for dinner meeting aside from the fact that Shenzhen hotels are much cheaper. In effect, I wil be getting in and out of Hongkong from Shenzhen for 4 days. I would like to know if I need to get a multiple entry visa and if so, if it is convenient to get it at the HK border. I have been issued a CHina visa before when I attended an exhibit in Guanzhou.