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
4th Floor, C Building, Tong Zheng Zhihui Industrial Park, Ting Shan District, Houjie Town, Dong Guan City, Guang Dong Province, Dongguan, Guangdong, China