USPS(United States Postal Service) also called EMS in China, it's China Post Express Mail Service, USPS is an International Postal Express Mail Service is offered by Postal-Operators of the Universal Postal Union (UPU). The UPU, a specialized agency of the United Nations, promotes the harmonization of postal services worldwide.  
  
USPS is the most priority mail service of posts, now covers throughout the major parts of the world. Using its largest structured network worldwide allows clients the freedom to send mails to almost everywhere in the world. Equipped with high-tech system and materials, such as the International Postal System (IPS) and latest scanning materials, clients become more and more confident.

When the goods shipping out by USPS/EMS, you can track your order from: http://www.ems.com.cn/english.html