A visit — yours or an inspector's — is the surest check on a new supplier. Send a date and what you want to see; the request reaches them as an enquiry you can track.
Address
Yuanxin Tech Park, No. 1, Alley 3, Shangwei Industrial Zone, Zhangkenjing Community, Guanlan Street, Longhua District, Shenzhen, Guangdong, China