Shandong Prestone is legally business stablished in China.
Their website is 3 years old. http://goo.gl/w8OehW
The contact details, emails, geographic phones and address are correct.
How about the bank details? do you have them?
I suggest strongly to hire an inspector to make a Factory Audit. This will tell you if you can purchase with confidence.
i m in shandong but never heard that company before .